Fastmark, I would ask your customer what his goal is . For me personally new technology would be to have a new car feel. I have personally built a couple of cars with both the firm feel level 2 and 3 boxes and although way better ,they still have that old car feel to them in my opinion . We have an E-body in our shop and we are using the magnum force transformer in the front and RMS street lynx in the rear . We just liked the looks of how well built the transformer is and wanted the feel that the rack and pinion steering gives you. And It really wasn't that much more than a complete Hotchkis kit if you are replacing everything.
Roadster shop also makes a nice setup for B-bodies , but it's not a bolt in.