Well, I would advise buying new aftermarket heads. There are many to choose from, and the flow #'s are incredible. For the $$ you spend on porting the 302 heads, you minds well have bought some aftermarket heads. Unless you are doing the port work yourself, or are going for the stock appearance. The 351 heads are better than the 302, but the aftermarket heads still flow better. If you go with 351 heads, the first years were the best, 1969&70. Do some porting, especially on the exhaust ports, and with the right parts you can go 10's in the quarter.
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Here, F-Body, Corvette, Grand National- I've got two suprises for you.
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