Rear end swap

teringer said

you will need to weld plates over the spring seats and drill new holes for the spring center pins the f bodys use rubber insulators around the springs mounts, and the spring seats are wider as is the drum to drum measurement, so might need to cut off the spring mount and move them closer.

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The spring perches are 44.5" c-c on the F-body's, A-body's are at 43"c-c. To use the F-body axle you'd have to cut the perches off and weld new perches on anyway, so there's no point messing with the stock F-body perches. Just get the correct perches and weld them on.

Sounds like the OP has an 8 3/4" anyway, so there's no reason to swap to the 8.25.