Do you know if your connecting rod bearings shells have oil squirt holes??
I have a theory that a lotta lifter/lobe failures are because folks use the later bearing shells used with the newer roller tappets, that don't have a squirt hole and they don't spray oil on the cyl wall and cam lobes like the old shells with the squirt hole (which are still avail).
I believe the squirt of oil from the connecting rod is nec on flat tappet cams.
So if you use the newer shells, I always notch the shells where the oil hole's supposed to be, and I've never had a lobe failure yet, ( I'm sitting on wood ). jmo
hope it helps