And to add to the discussion, I copied this from that first link. Of particular interest to the OP intent, see the third note at the bottom.
Ever wanted to know which engines shared bellhousing patterns? Want to swap in a new motor and are wondering if it will bolt to your existing transmission? Now you'll know! To the best of my knowledge, this list should be correct, however there may be some errors. These is no substitute for your own research!
FORMAT: 808 x 606, 89K.
I am now on a great crusade! I am trying to compile a a list of all the Ford engines and their bellhousing patterns. I am looking for pictures of the back of all the engines listed below as well as some measurements! If you have one of these engines and it's just laying around your garage, please take a picture and please do some quick and easy measurements.
You can click on the example on the left for an example. You don't have to do the picture like this. The picture by itself and then writing the measurements in an email would be great! Once I have a few pictures together and more measurement info I will post a seperate page with the pictures and measurements. I hope to get pictures of all the patterns and measurements.
Once this gets going, I will also start working on transmission measurements.
If you have any other additions or information, please email me!
Also note that even though you'll be able to bolt the engine to the transmission of you choice, you'll still have to figure out the flywheel/flexplate/starter/input shaft/torque converter pattern/etc. issues.
221 V8, 260 V8, 5 bolt 289 V8
3.8 RWD/4.2 V6, 255 V8, 6 bolt 289 V8, 302 V8, 351W V8, 351C V8, 240 I6, 300 I6
351M V8, 400 V8, 429 V8, 460 V8
2.3 FWD I4, 2.5 FWD I4, 3.0 Vulcan V6 FWD/RWD, 3.0/3.2 SHO V6, 3.8 FWD V6
FE Series - 352 V8, 360 V8, 390 V8, 391FT V8, 410 Merc V8, 427 V8, 428 V8
1.6 I4, 1.8 I4, 1.9 I4 (Escort, Tracer, OzCapri, Miata)
2.6 V6, 2.8 V6, 4.0 V6
2.0 Pinto I4, 2.0 Zetec I4, 2.3 Capri II
2.3 RWD I4
4.6 SOHC V8 RWD, 4.6 DOHC V8 RWD, 5.4 SOHC V8, 5.4 DOHC V8, 6.8 SOHC V10
2.5 Duratech V6, 3.0 Duratech V6, 3.4 SHO V8, 4.6 DOHC V8 FWD
There are some notible exceptions and other interesting notes.
The 400 V8 was also available in a rare casting in 1973. In some full-size Ford, Mercury & Lincoln products the 400 was cast with the small block bellhousing pattern like the 302. It was mated to a an FMX transmission. These blocks are fairly rare, but it would make it easier to swap into various Capris.
A lot of people assume the 2.0 and 2.3 I4s share bellhousing patterns, and in some cases they do and in other cases they don't. In most cases 4 out of the 6 bolts between the engine and the bellhousing are the same for a 2.0L and a 2.3L, but the top two are different. On the 2.3 they are about an inch higher up on the block. The other possible difference would be the dowel pins on the bottom two bolts being slightly larger in diameter for the 2.3. The one exception is the 76 and 77 Capri. The 2.3 bellhousing in these cars are identical to the 2.0 bellhousings found in previous Capris and Pintos.
If you are planning to swap a 2.0 Zetec into a Capri and want an automatic C4, you can use a bellhousing from 2.0 Pintos and Capris before 1975. You may be able to use a 4 speed bellhousing to adapt a T5 to the engine as well. Remember however, you will have to find the proper flywheel. A 2.3 flywheel/flexplate will work work with the 2.0 Zetec.
3.0 Vulcan V6s were the same in front wheel drive and rear wheel drive applications.
The 3.0 Duratech FWD(Taurus, Sable, Escape) and RWD(Lincoln LS V6) are the same bellhousing pattern.
The Mod motors share bellhousings, but the flexplates/flywheels are different. Cast cranks got 6 bolt flexplates/flywheels while forged cranks got 8 bolt versions. The SHO V8 shares the same crank bolt pattern as the forged cranks in these motors.
The Mod motor bellhousing pattern is fairly close to the small block Ford bellhousing pattern. Early 4.6 blocks in 91 and some 92 models were exactly the same as the 5.0/SBF bellhousing pattern.
The 2.0 Zetec motor DOES NOT match the 2.5/3.0 Duratech & 3.4 SHO V8. The 3.4 SHO V8 and the Duratech V6s are a match.
People have said that the Duratech bellhousings changed in 1999 making them incompatible with earlier engines of the same type. From what I've researching, there was a change to accomodate the MTX75 manual transmission. However, I am not sure what that change was. The SHO V8 '99 block matches the 3.0 V6 Duratech V6 block bellhousing pattern, and all the SHO V8 blocks are the same. Not sure what to think of this. There are a few EXTRA holes in the 3.0 Duratech V6 bellhousing pattern, all the other bolt holes are a match. Perhaps these extra holes are the difference?
The earliest two castings for the 4.6L Mod blocks, used prior to late 11/1/91 in Lincolns and 2-18-92 in full size Fords, share the 302/351 small block bolt pattern exactly. The casting numbers that fall under this category are F1AE and F2VE. The change in bellhousing pattern coincided with the changeover from the AOD transmission to the AOD-E, which resulted in relocating two bolt locations, going to larger, hollow dowels, and changing to a three bolt starter. All subsequent Romeo mod blocks beginning with the F3VE use the AOD-E pattern, and all Windsor mod motors use it.* Thanks to Chuck Sanders for this info!
Sometimes, I'm as confused as a baby in a topless bar.