Brent,
Beg to differ on the lifter/cam solid vs hydraulic theory.
Years ago people used to convert their hydraulic lifters to solid.
Running solid lifters on a hydraulic lobe gives no quieting ramps since the base circle on a hydraulic cam is a true circle right up to the opening ramp and down again from the closing ramp.
This gives very noisy operation.
A solid cams' base circle has it's clearance opposite the lobe nose and is gradually taken up to zero before the opening ramp.