I converted my Rambler to R&P with the stock crossmember, see it at http://groups.msn.com/AMCsForever/cl...t.msnw?Page=2.
I had to make a bracket that held the R&P out the correct distance from the crossmember. I also discovered that the steering arms for the Ford R&P (arms on the spindles) are 5" from center of ball joint to center of tir rod end. The stock arms on my car are 7" from the same locations. This greatly reduces the turning circle. AMC has separate bolt on spindles, arms, and steering knuckles, so I'm making new arms from 1" square tubing. You'll have to bend or cut and weld yours if they are much longer, or just accept the shorter turning circle.
The T-bird, Aerostar, or Mustang rack (all are the same) works if your steering linkage is in front of the crossmember, use a Taurus rack if in the back (or a GM rack from a front drive car). There are two GM designs: one similar to the Ford found on Chevettes and some other rear drive vehicles, and the more common type that has the tie rod ends near the center of the rack used on most front drive vehicles. I'm not sure which you'll find on what car, you'll have to go to a salvage yard and do some "shopping" if you want to use a GM rack.