8 1/4 rear question

appreciate all the thoughts. Keep them coming but do like the 65-67 b body swap so far.
Did this swap before, and just did it again in my '76 Duster this summer. I have another one I'm getting ready to put in my '74 Duster. 65-67 are the best for A-bodies, but the 68-70 are just about the same width.