I have double adjustable QA1 on my Challenger. For the money I think they are great. I had RCD Bilsteins and when I went to a composite rear leaf spring they couldn't keep up. The QA1's work great though.
I do know for a fact ( as I have both) that A-Body LCA's are 3/16" longer than E-Body LCA's. I believe ( not 100% sure) that E-Body70-74 and B-Body70-72 are the same length, Not sure about earlier B-Body's?