until you want to go to max wedge size ports it seems trick flow are better than anything else. the low and mid lift flow is better on the TF heads. 300cfm by .500 lift, and they have nice springs already.

the cheaper promaxx or sidewinder castings are tempting, and would probably work fine for a 500hp build but i keep telling myself just get the TF heads. then i'm set if i want to slide a larger solid cam in and make some more power...