I probably bought wrong 8 3/4

There were no A-Body 8.75's in 74 so it would have to be a 66-72 if it is in fact an A-Body rearend. Center of perch to center of perch is 43" for an A-Body and 44" for 66-70 B-Bodies. I believe the A-Body 8.75 rears were only about 55" from axle flange to axle flange.

Joe