A833 overdrive V8 bellhousing?

This are the bearing retainer part numbers for the 3 gear boxes I have in my garage, for a 273 V8:
(1) Aluminum case 833OD from a truck = C13157.
(2) Iron case 833OD from an A-body = C13157.
(3) Iron case 833 from an early A-body, with b&t flange = C94796. The bearing retainer hole in the OEM BH for this early A-body 833 measured 4 1/4" = 110 mm.
I also have an aftermarket BH, and the bearing retainer hole measured 4 13/16" = 123 mm.