I agree. RPM intake with GOOD street heads will meet your power goals without having to go with a big cam. Go with EQ, RHS or well set up Eddys and 400hp is a given. It's also doable with ported factory heads and the 'small' cam. However, finding well-ported iron heads (or identifying well-ported heads rather than botched ones) takes a little experience. And those pistons really want an aftermarket closed chamber.