Thanks Tom. I figured that marine cam had too much duration(260) for the oversized valves.It runs great with the stock head. What problems will I run into going beyond .500 lift ?
Here are a few grinds recommended in the power manual based loosely on your parameters of 215-220 duration and .500 lift.

1. Duration 194I/204E
Lift.464I/.494E
Centerline 110

2. Duration 212I/218E
Lift.518I/.530E
Centerline 109

3. Duration 210I/212E
Lift.490I/.508E
Centerline 112

Could you comment on how any of these might run in my build? All input is appreciated.
Thanks, Conan