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You will be fabricating motor and trans mounts to get the later model V8 in the car so I would suggest picking up a "mock-up" block. 326 to 455 Pontiac blocks are all the same size so, no matter what you end up building (400 block with a turned down 455 crank would be good), you will be able to bolt it in.
The more cubes you use the milder the build can be to get the same amount of power. Torque gets the car moving off the line and that is what Pontiacs make. :)
Mark
 

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Thanks for being civil Jim.
Horsepower is a "derivative" of torque. Without torque you have nothing...
I hope the OP hasn't been scared off by the rudeness. We are all trying to help and any Pontiac you decide to build will greatly outperform the sixer you are shoeing now.
Mark
 
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