Vinnie is right .. those heads wont hold much lift.. or valve spring without some machine work the valve spring pocket and guide.. in reference to is the cam too much for the heads... i say no.. most would say the head is done at 6200.. we run a similar combo every sat. night on a dirt track.. turn the engine 7000-7200 with a 2 barrel. Some may say that that is way too high for the head and cam. We thow gear at the car until the engine runs out of breath.. that is usually around 7000 rpm. what are you really trying to do.. ? win an engine builder shoot out or have a good time with your car? I think you will be find.. make sure you dont have any clearance issues with the heads and run the thing.. If you want something better by a set of Elde Aluminum RPMS..