thoughts on cam?

Look into he Rhoads VMax if you're thinking about those type lifters. They offer one with direct oiling to the cam lobes. Only one for the small block that does, I think. They ain't cheap, but they offer something the rest of the variable duration lifters do not. Adjustability. You can adjust them on how much they bleed off. They adjust in a similar fashion to a solid lifter using feeler gauges. They can actually even be used on a solid camshaft. They can sustain very high RPM.