a buddy of mine ran the edelbrocks OOTB on a 448 inch 440 with a .590 mp cam and they worked great.

On the stealths i hand ported did the bowels (I'd say a big gain there) port match smoothed and worked the pushrod pinch about .100 but not overboard after I was done they flowed 285 on the same bench the guy that owns the machine shop got 257 with an out of the box stealth he said a nice gain with the work I did.

Knowing the clearance issue with 3/8 pushrods on the stealth I clearanced quite a bit and when buddy assembled the motor had to do one or two spots some more. It's almost like the head casting is inconsistant.

Still better than iron heads and way way nicer to port! Porting iron sucks!!!