Think you'll be a lot happier with the Edelbrocks Roland!!!! I've never used a set of the Pro Comps, but I've seen a few sets....As cast, they are quite rough on the ports and runners...probably fine if all you want is a set of heads so you can say you have aluminum heads...but performance wise on "out of the box" heads, pretty tough to beat the Edelbrocks....unless you want to lay out "a few more bucks" and go with a set that are already cnc'd, but for street use, my money would go to the Edelbrock's. We have a set on the 501 incher in the Comet, always going to take them off and do some port and flow work....but the car is still runinng them as they came out of the box, and still running 9.90's !!!!!!! Besides, Vic still makes all his heads right here in country....