I try to keep them 12 bolts unless my customers won't let me. A good 12 bolt can handle a lot of power. We put 900HP to a stock 12 bolt Camaro rear with a spool and a rear support. And that is dead hooking with low 1.30 short times.
12 bolts are more efficient due to pinion location, A 9" pinion is always trying to climb the ring gear, eating a little HP along the way. Is a 9" stronger then a 12 bolt? Yes! is a 12 bolt capable of handling what most mear mortals with throw at it, with a street car? Yes.
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