A body - B body spindle swap

I run 73-74 E-body and 73-76 A-body spindles (same part number) with 11.75 disk.

The 70-72 E or B body spindles will not accept the larger inner bearing of a 11.75 disk.

A 73 and up B-body will have the bigger inner bearing. It's a slightly taller spindle. IIRC, it's the same spindle as the F-body Aspens. IMHO, nothing wrong with slightly taller spindle. As shown in the article you linked to.