My 422 smallblock build

I’m in the house now but are you talking about the tubed side. I’d so it gets tapped for a pipe plug and set up so it is FLUSH with the block or countersunk some. If I remember you drilled yours 5/8 inch right (1/2 inch house copper pipe). I drill mine 9/16 and used that stainless pipe I found. I block my oil a little different than you did. I tap the front of my galley with a 5/8 set screw that blocks the oil feed hole instead of doing it down on number one main.
Yeah the tubed side. I’ll look at possibly tapping the hole but the feed from the #1 main is only 1/4” into the whole. I think a pipe plug would either block the feed or stick out the face too far. Suppose I could grind it down except I broke my bench vise last week and haven’t made it to Harbor Freight yet.lol!