you need to figure out some goals before you go spending a ton of cash on parts.
12-bolts are nice, but for the average to reasonably quick street level car they amount to little more than a weight reduction mod on your wallet. you stock 10bolt is an 8.5, very strong rear.
get yerself a good posi unit, auburn pro series or equivalent, and a set of gears that matches the way you intend to use the car and the power band of the motor.
also, what kind of a rebuild is teh motor getting? build up or just a freshening? mild or wild? have you considered a crate motor?
let us know what the final goals are and the members will help get you there.
later
tim
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