6.1 Hemi 69 Barracuda Fastback Father Son Project

Just measured the 8-3/4 rear that came out of the 69 Fastback
54.25" flange to flange and 44" perch to perch center to center.
Yup, 65-67 B body 8-3/4. At first I was bummed but now I'm Happy.
Pros and cons of using a B-body rear axle assembly???
Think it will work just fine with the 17"x9" -5" BS YO Rallye wheels and the Doctor Diff Spring relocate kit.
275/40-17s should fit just fine. The fronts, not sure what will fit but I can test fit the 17x8, 245/45-17 fronts from the rag top.
72BluNblu seems to have the answers to most of my questions if I dig enough. :)

An accurate 8 3/4" rear axle width list