318 simple bolt on setup for more horsepower

Stock 4bbl's better than the Performer- somebody listed good intakes worth moving to. If you're actually looking to make good power I wouldn't be putting other 318 heads on there. Either some later 360 heads milled down if you're not doing the pistons or move to aftermarket Magnum replacements. There's a lot of even 318 long blocks that'd increase the power well by swapping to them over keeping what's in it.