"rebuild'" is a broad term.
What you find will dictate what parts you need. Not a lot of choices to be made.
Read the ATSG manual to determine if this is something you feel qualified and equipped to take on.
If you don't know the condition, install it but loop the cooler line so you can test without contaminating the new cooler. If it works, drop the pan and change the filter. It is normal to find a little sediment from wear in the pan on a high mileage trans.
I suggest a low and simple maintenance manual trans conversion that will cost less than an auto rebuild.
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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS
viewtopic.php?f=5&t=13225&p=134742Simple Spring select
viewtopic.php?f=5&t=11815LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12