i'm not sure of what a 10 bolt is worth but as for the 12 bolt vs 9" I think it all depends on what your running in your car. For the High HP engine or with twin turbo's look'n for the drags the 9" is the stronger rear end but if your going to do a nice street/ cruise car I'd go with the 12 bolt. The 12 can handle plenty of power. I plan running my orig 12 bolt posi with a 500 hp 6speed combo in my 68 camaro. hope this helps........
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