I called and talked with Gary...
and he is a 'stang guy himself. He told me that they have people drag racing, circle track racing, and road course racing using his suspension. He is quite knowledgable concerning desirable suspension behavior.
I have already done the R & C front suspension transplant on my '66 'vert. For the rear, we are relocating the leafs to the inside of the frame rails, fabricating some support, etc. This will be a play car...had thought I would add a turbo to the 5.0 efi motor, but am now going to use a Kenne Bell blower so that I can break loose the huge rear tires that the re-work will allow.
When I get around to messing with my 2+2, I may go with the Martz rear end. Gary was getting ready to go do some performance testing on his '65 and I will be interested in hearing how it comes out.