I was thinking of using Edelbrock Performer RPM intake as you mentioned. I like the Edelbrock 750 as well, So I may go with that to. For the Comp Cams Xtreme Energy 274H it's at 230/236 degrees at 0.050 inches, 274/286 (measured at .006-inch tappet rise), Lift for that cam is .488 int./.491exh.