The cam that I have is a Crane Cam with 238 int / 244 exh @ 050 in lift with 0.502 int / .0516 exh lift lobe separation of 106 degrees. Now that I have the specifics on the cam lets say that the heads are just out of the box Vortec 12558062 heads with 1.94/1.50 valves with 64cc chambers. Would this be too much cam for these heads? I did have the heads milled to increase c/r but can't remember how much.