B-body disc brakes

The interchange on B-body to A-body disc brakes is complicated, and I wouldn't even bother.
For '73 up A-body brake systems, these might work.... '71 and '72 B-body rotors won't work. '73 B-body rotors should if they are the slider type on 10 7/8 rotors, '76-'78 B-body will. '76-'78 B-body Calipers may work with '73 A-body disc setups if they are are on 10 7/8 rotors. B-body steering knuckles won't work, they are too tall. Whew.