Edelbrock heads - acceptable tolerances
I ran a set ootb for a bunch of years on a mild street 408. Got around 1hp/CID- dynoed at 350/400 at the wheels. I never did hook it up good at the track without breaking parts (4spd) but it was MPH'ing around 108-110. For what it was- a clean upgrade to tired iron heads- I was happy.
I just got them back from Shady Dell where they got a clean up deck, his "stage II" porting, and a nice valvejob. I can't wait to feel the difference!