It’s hard for a hydraulic lifter to function properly when there is a .020” hole in the bottom of it, leaking oil out.

Get some Crower Camsaver lifters for an AMC v8.
Those will have added oil to the cam and pushrod oiling.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads