If the lifter face had a hole in it (worn) you can stop doing anything and closely inspect the camshaft without the intake in place. You have engine damage and the more you swap in used parts and run it the more damage is done. If the cam lobe that killed that lifter is also damaged (and no, it running with another used lifter for ANY time is not helping) then you have serious repairs. Inspect it. Closely. Immediately.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.