Rear end options.

Contrary to common opinion, Cone-type suregrips are/can be, rebuildable. Easy-peasy. Just cut .060 to .080 off the cones and install a appropriately sized hardened washer between the cones and the side gears. I tighten the backlash up until it starts to turn funny, then back-off to the next thinner washer, to allow oil clearance.I use Ford side gear washers cuz my local ford dealer keeps 'em in stock. For street I set them up with about 120 ftlbs of turning torque with EP oil liberally coating the guts. Too much more and they squeal a tire at every corner, unless you are running at least 275s. Under a 100pounds, they begin to slip, and I get a do-over.I hate do-overs.
If the cross-pin holes are egged out, I have had a local machine shop weld them up and re-machine them, with good success; However, it ain't cheap.If it needs both jobs performed, I would recommend a good pick-a-part. You will be money ahead.
On the street that 8.25 with a tight set of differential gears and street tires,can take a pretty good licking, even with 275s or better.The trouble starts when the SG dies, and you start peg-legging it.