[cableguy0]

Those heads are nothing special. You should not run roller rockers without screw in studs and guide plates. That lesson costs about 700 bucks. Any performance head will have screw in studs and guideplates. It doesn't matter if a machine shop ported them or you bought a set of dart heads. Its all the same. Roller rockers and a big cam with heavy springs will rip those studs out of those heads in short order. Its a lot cheaper to spend more money in the first place to do it right. Im really not trying to hurt your feeling or rain on your parade. I had to learn a lot of things by coughing up stacks of hundred dollar bills. Its a lot cheaper to listen to free advice being given by some smart guys.