rear end Width
Nuke that POS chart from your memory for A and B body 8.75 widths. I wish I could delete it from every site on the web.
52 5/8 flange to flange, Perches 43" on centers for an A.
Here is a better source that is accurate.
http://www.moparts.org/Tech/Archive/axle/16.html
The 65 b rear is only slightly wider ~1.25" per side and the perches are 44" on center