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.