You can get 8.5 rears out of (IIRC) 72 & up Novas and similar. Posi units can be added later if you find one w/o it.
2nd gen posi with a few bucks to sell. You might even be able to trade with someone else with the wrong rear. I see this question a lot.
Also, someone might want a proper date coded 8.2 for a Camaro, so that might not be worthless as it seems. I would double check the rear to make sure it was never swapped. 38 years is a long time with the same rear.
