I'm building a 470 engine with the TF heads, should have it on the dyno in a couple of weeks. My engine has flat top pistons with a small dish to make 10.5 compression. I'll run a solid roller cam, a Victor intake and a 850 dp carb. Basically a pump gas race engine for the guy who wants to drive a 10.0 car back and forth to the track, or just doesn't want to pay for super expensive race gas.