Dave I would all cappolla, He has done quite a bit with 5.0s. As far as head GT40 heads have 3 “bars” on the front of them. and GT40P heads have 4. I made 290HP with my motor. Its basically a Ford racing cam, intake,headers and gt40P heads. Otherwise its 100% stock.
You can see the “bars” im talkin about on the front of my head.