lowering the 64

Hi all
Im trying to find some rear leaf spring to bring down the rear. I know some say blocks but I want new springs that have a firmer ride. The front springs I found at dearbourn classics. Now for shocks. What is the height and stoke diffrence between a mustang and these cars. I installed a airride setup on a couple 69 stangs when i did the cars for XXXII (yes the one in M&F) and I was wondering if I can make these fit. Thanks all