I'm not trying to panic you, I just think you need to do some basic checks on the health of your engine before you chase the lifters to much. You don't want to spend a lot on money on a shot engine. Maybe someone else will chime in on what else might cause burning oil if that is what it's doing, but it could be valve seals, rings, etc. I think I've seen threads where incorrectly installed catch cans having caused oil consumption. But I'm just speculating from the other side of the world.
https://easyautodiagnostics.com/gm/4...ression-test-1
Throttle Open