You guys understand that drilling holes in oil gallery plugs at the front of the engine has NOTHING--absolutely NOTHING to do with lube on the timing chain?
The lil' holes in the oil plugs are to bleed air out of the gallery at start-up, so the hydraulic lifters don't tick.
There's press-in cup plugs with holes drilled in them direct from Chevrolet. Melling sells replacements. If they can do it, I don't know why we can't.
https://www.summitracing.com/parts/mel-mpc-52v