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You can find pontiac 400 engines around for pretty cheap usually, 455's cost a bit more. There is nothing cooler sounding that a big inch poncho with a nice cam in it. Check the head castings, if it is an early motor they may be 6X heads already, if they are small chamber, they are often refered to as 6X-4's, they are really nice for performance with very little clean up work.
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