Im running nearly the same set of heads as you are, the valve guides are a known trick flow problem esspecially in the early pedestal mount cylinder heads, just a thought check your guides out. it they are brass you are probably ok... as for the intake gaskets, i think the problem with the fel pro 1250 was the builder cut the gaskets to thin around the water jacket, i myself had the same problem. what intake are you running?? edelbrock suggests the 1250.. just dont mod the gasket just put it on...
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