Hi,
You should keep to engineered air intake such as the Ford GT-40 "P" heads under $600/pair, motorsport "F" cam $190, edelbrock RPM dual plane intake $155. Summit racing carries all this stuff. Should make an honest 80 HP and know it works, Ford's R&D spends millions to make sure it does.Should make power from 2,000 to 6,500 rpm.
Have fun, just make sure you put the head gaskets on with the 'front' stamped on them to the front or the engine will overheat. Also the short headbolts go through a water passage and need thread sealer on them.
Perry.
