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sharpe one is right. by time you go through a set of cast iron heads you can buy new aftermarket. If you want to stay cast iron buy windsor jr, protopline ect. I have GT40 heads and have had several aftermarket aluminum. There is so much more in aftermarket heads for the same money. Just my opinion No stock cast iron head will flow enough to support the cams that are on the market now for a 302 and don't even think about a stroker with stock cast heads. Go to Air flow research's site and look at the article on all of the various heads for a 302 an then decide what you want the engine to do.
good luck
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