7 1/4 worth rebuilding?

Understandable, the 8.25 will be cheaper and they did come in a bodies factory. Will have to have your driveshaft shortened with either axle swap. The 7.25 has a 2.5" axle tube, the 8.25 and 8 3/4 are 3" tubes, so different u-bolts to clamp it to the leafs and shock mount pads are needed. Different shock mount pads or slot the holes in the ones you have for the 3" u-bolts. 8.25" axles did come with 3.23:1 or 3.55:1 limited slips if optioned. If you find one in a salvage already removed or in a parts car, check the cover for a tag that is on one of the bolts to the cover. they often have the ratio stamped on the tag, spin of the axles and see if the opposite axle spins the same direction for a limited slip