Call me stupid, but why do you need a rotating assembly, pistons, flywheel, alternator, and injectors?
Depends on your overall goals for the motor. The Trickflow heads are great, don't get me wrong, but they really only show gains over ported stock heads at much higher RPM. From 5000 rpm downward, the ported PI heads will probably make more power. Up to 6500ish, the gains are marginal. But at 7k+ rpm is where they REALLY make a lot of power.
That being said. Most folks don't build a street motor to make power at 7k+ rpm.
(Disclaimer: I don't have any first hand experience with these heads, but it is what I've read multiple times now by people who do know.)
Personally, I'd shoot this guy an email if you are really serious about building a motor. Modularheadshop - MHS
just lookin for a quick n/a street car but i think i might sell this car keep finding things more and more wrong with it everyday