I put the Fatman R&P, as well as Charlie's disc kit, and home-made shock relocation and beefed-up front anti-sway bar on my '38 Chrysler.
The shock relocation did require some creativity because the stock lower mount wasn't where it needed to be, but the same was true when it came to mounting the modern-style sway links to the lower control arms, so those problems got handled together.
The R&P went in with no problems and no bump steer as long as you read the slightly unclear directions many times, measured 3 times, and scratched your head a lot.
I would advise anyone who does this not to use the "Sport" ie. fast ratio Cavalier rack. The standard ratio one would be plenty fast, and I've been told that it has a slightly longer throw too. Iirc Nissan 510 tierod ends are used on Fatman-supplied adapters. I'm sure I still have the instructions if anyone needs the exact info..
Also, the GM canned ham style PS pump I used supplies more pressure than is desirable (at least on my car), so an adjustable PS valve should be plumbed in.
At risk of drawing wrath, my car came to me with a sbc already installed (I plan to replace it with a 360...) on mounts modified from something like this: