Re: Ram Air IV versus 455 HO
I think you will find that the Pontiac 10 bolt has the cone type posi as well. Our Oshawa built '72 455 Lemans Sport has the Chevy 12 bolt rearend.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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