Trick Flow 240...

I ended up making a peak of 750 hp with the 240 heads but that was a pretty serious engine with a large solid roller, fully ported intake and a take no prisoners oiling system. My street engines usually make around 600 hp with the 240 heads. Pump gas compression, mild hyd roller, port matched intake, etc. The Trick Flow build up is a reasonable street engine build but those heads are capable of a lot more power if you're willing to turn up the wick. On a drag only car a guy should be able to achieve 700+ hp with 240 heads if he is willing to spend some money on good parts.