I’ll say it again.
I never use the plugs. My oil pressure isn’t low. In fact most people think it’s too high.
Run them or don’t but it will not affect your oil pressure with them out. Even with that relief in the plate you have.
How do I know this?
Because the leaks at all 16 lifters is 25 times what that little leak is.
I haven’t done a test with the cam plate but I did do a test with the timing cover off and my gear drive with no plugs.
You had to look hard to see any oil getting by the plate. It was a sheen at best.
If the block is so ate up or warped or the plate isn’t flat (that’s an easy check) or both, the oil leaking at the plate is minuscule at best.