8.5
I have run an 8.5 ten bolt in a 67 camaro with 600 hp and a 12 inch slick with a power trax locker and a 3000 stall about 350 eigth mile runs and never had a problem, saw a lot of proplems with the 8.2 rear end, the 8.5 is more durable then most give it credit for, the one thing your 8.5 wont take is a trans break if you are coming off the foot break where your drive train is loaded you will be fine.