One really important thing to clean up- a BBP 7.25 axle is NARROWER than an A-body 8 3/4 with BBP axles. Flange to flange a BBP 7.25 is only 51.5”. Mounting surface to mounting surface is 56.75”, the BBP A-body 8 3/4 will be 57 13/16”. If you’re talking about adding disks you add another 5/16” per side.
Which means wherever your wheels are now, they’re gonna move out over 3/4” per side.
