The topic below is mostly about using an IRS and having matching, late model concentric ring wheels.viewtopic.php?f=5&t=13225
Since you are using lug centric ranger bits, I suggest using a 80s lincoln town car or crown victoria spindle, brakes, outer tie rods. Get the toe adjuster too for modification if necessary. These vehicles have a steering box rather than a rack and pinion. Pinto/mustang II is another option and comes with a rack.
Stock racks are too wide from inner tie rod pivot to inner tie rod pivot because lower control arms tend to be longer on a locost. Even a miata rack is too wide. You can use a front steer rack from anything if you make an adjuster to fit the tie rod that comes with the spindle. It may be best to go aftermarket, using a rack for a rail buggy or similar application.
My reverse trike build log: viewtopic.php?t=11384
Fitting glass and weatherstripping: viewtopic.php?f=23&t=6451