A ported head and manifold/carb that can keep up can get you more power. However thats only if you are going to take full advantage of the increase in flow capacity. Generally that means you need to turn the rpm up. HP = (Tq x RPM) /5252 keep in mind the importance of rpm on that equation. If you make say 550 HP at 6000 thats 481.33...ft/lbs at 6000. If you increase your mass air flow and make changes that make the same 481.33... tq, but now at 7400 rpm your HP will now be 678.33... !
If you port your heads to 340 cfm and match the rest of your build to that flow capacity you are likely going to be able to make peak power at @ 7400 rpm or higher depending on actual VE. You can make more HP than that at 7400 IF you increased VE capability with header/manifold tuning/sizing, cam changes etc. that allow for it. A 340 cfm head should support at least 700 HP at pump gas compression and considerably more if its well refined.
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