Patricks makes a couple cams. I have the 251 duration "rumpy" cam. It runs killer and has a nice lope at idle. I would recommend it if you are going to build a pretty souped up chevy. My motor is bored .080 over and has a 848 head. The block was milled .010. I also am runnins dual carbs, and dual 1 3/4" exhaust.