8 3/4" Rear questions..

Has the rear already been shortened for a-body?
I don't believe it has.

Which of the B BODY rears do you have?

Here's the flange to flange measurements:

'62-'63= 53 1/4" (And '64 Max Wedge)
'64 = 55 5/8" (Exc. Max Wedge)
'65-'67= 54 1/4"
'68-'70= 54 15/16"
'71-'74= 57 7/8"
Let me double check when I get home today, I measured it months ago and exact figures are blurry now.