Full road race build? Standard leaf spring setup? Seems like overkill compared to poly bushings for rear leaf springs. I put them in the front thrust arms on my 2000 BMW M5 and it tightened up the turn-in and was an improvement in steering feel, but I'm not sure the reduced ride quality on was worth it. That is a seriously stiff chassis, so the difference could be felt. These 60-70's chassis are wet noodles in comparison.
