829 lifters?? The 829 is the standard Mopar lifter. The 892 is a generic 0.904 lifter which may or may not work in a Mopar block. I've never tried the 892 in a stock block but they might work in a World block.

Sounds like you're into an R&D project. If it just the pushrod oiling hole then it might not matter if it is exposed at max lift. That just means that the pushrod oiling would get cut off for a few moments each cycle. It will not have anything to do with oil pressure since that hole isn't connected to pressure.