I have them on my 428, 83cc chambers with flat top pistons and roller cam. I like them. I also had Dave at SD port them and shape the heads he also port matched the intake, I matched the exhaust. Mine is 10.5:1 ratio with zero deck. Seems to run ok with lots of quench and an efficient heart shaped combustion chamber.
The only concern I had was the bolt threads are not heli-coiled, but I had no problems with that. I don't know if the Edelbrock ones are or not.