I've beet my brains out over this cam thing a few yrs back, with a billion calls to Summit Racing, Jegs, Lunati, Crane Cams, so on and so forth. The big point to ponder here is the fact that you have a 4000lbs if not more truck. Its not hard to turn it into a big lopey turd. They will all tell you that torque moves mass, and anything over a 218@50 is bad for a heavy truck. So i just had to get something a little better for my 9.0:1 350 sbc, (EX270 Retro-roller) 495in-502ex/218-224@50 from comp, which has a very nice rumble to a slight lope. Good luck