Is the current camshaft a solid roller lifter, solid flat tappet lifter or ? I'm thinking the duration at .050 is where your showing the bottom two lines: Intake .450 degrees dur 268,
Exhaust .430 degree of dur 276. What I'm saying is the duration at .050 is 268 on the intake and 276 duration on the exhaust. that is a fairly big cam, I run one in my pump gas street stroker motor(518 C.I.) that has a little les duraton at .050 My motor made over 650 HP with Eddy RPM heads on it and over 725 HP with a set of Indy SR M.W. heads on it with a single 1050 CFM Dominator carb on Oegon 91 octane pump gas I have several other motors with Comp Cams XE---HL grind hydraulic cams in them, I would probally use the XE285HL grind in your motor