AMC lifter in an LA engine

Yeah, use the best, strongest, thinnest pushrods you can. If you have bad harmonics, find out what was missed and fix it. If you need oil up top, use hollow tips that match your rocker radius. If you dont. Use solid tips. The hole in the top of the lifter doesnt mean you will have a loss of oil pressure or anything. Oil does not bleed through that hole unrestricted. It really only trickles out of there. Like was said, hydraulic lifters were set to "AMC" mode on Mopars decades ago in the aftermarket parts industry. No problem using them.