Doug’s oil holes are like the Comp 892’s, and with the cam I had in that 572, the holes that were in the bushings with the block as delivered from Bill Mitchell, they lined right up with each other when the lifter was on the base circle of the cam.
And that will get you some serious oil flow to the top end of the motor.

Fundamentally, that oil hole placement is for a Chevy running .904 lifters.