I don't think there is any Ford-produced or reasonably streetable aftermarket head and intake that won't fit up. About the only thing you have to watch out for is emissions compatiblity if you need it (do the heads and/or intakes have heated crossovers for EGR) and header fitment. Header fitment is really only an issue on GT40P headers and then "highport" heads, which literally have the exhaust port exiting 0.100" or more higher than stock. Most of those would be at least on the edge of "too big" for a street driven 302 though.
The exception would be if you have a used set of heads or intake that has been milled significantly, that could cause fitment issues which I gather can be somewhat pricey to rectify.
The exception would be if you have a used set of heads or intake that has been milled significantly, that could cause fitment issues which I gather can be somewhat pricey to rectify.
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