Don, a mechanical valve train head oils just like a hydraulic valve train head, so with the exception of the work around for the rear rocker shaft bolt, not much changes.
The big oiling difference between a hydraulic and a mechanical system is not in the head.
The big difference is the full groove on the rear cam journal of the hydraulic system sends oil to the rockers 100% of the time the camshaft is rotating. A mechanical cam with only a drilled hole through the rear cam journal sends oil to the rockers a few degrees of camshaft rotation.
