Looking for 8.25 or 8.75 rear end

I didn't think the 7-1/4" rear end was used on mopars beyond 1973 or 1974. I would check the rear end (# bolts on diff. cover, casting number, etc) to verify before you buy a new one.

Both my 73 Swinger and my 74 4 Door came with 7-1/4"
The 74 also came with a 318 from factory.