What A-body did this 8 1/4 come out of?

Roy,

What's the measurement from wheel mount to wheel mount? If it's in the 57.25 range, it likely came from an A body.

I already have it a part. But the flange to flange ( where the brake backing plates bolt on) is 51 1/2" . Overall, from the end of the housing where the seal rides to the other is 54". The perches are 43" c to c and they are the standard style perches. I've got the wrong SG with it, one for 2.45. So I need to find or build a 1/8" ring gear spacer so I can install some 3.55's or 4.10's.