318 build up suggestions

And if you do stay with small port heads (stockers, 302's) you'll probably want to find a small port intake manifold, which the RPM air gap is not.

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The stockers, AKA 302 or others, will open up to a RPM window and could be a good head for the project after porting. Depending on if it can be done cheap enuff. It's kind of hard to beat the RHS price and performance combo.