My machinist was very pleased with the quality of my 84cc Edelbrock E Streets. Only problem was he said the valve guides were too tight on three of the guides so he corrected them, lapped in the valves, and cleaned up the ports and bowl area all for $250 on these $1100 heads. He also sold me a nice set of Isky ductile iron rockers with upgraded spacers and hold downs for $300. So I'm into to these for way less (maybe half ?) than the cost of a pair of Trick Flows, ARP rocker studs and the recommended Harland Sharp rockers.

But yeah, if I was starting from scratch on a build, not just swapping out my stock iron, and really needed 600 hp for my street car to hit a certain number at the track, the Trick Flows would be the way to go from everything I've heard about them.