Quote:

My axle measures 44" perch to perch. Is that a 68-70 B rear?




I think all b-body is a 44" perch to perch.
Found this in the tech archives
Flamge to flange width for b-body
'65-'67= 54 1/4"
'68-'70= 54 15/16"
The earlier rears are about 3/4" shorter.