Magnum intake drilling plate project

Sleeve goes in the tube welded in jig, first 19/64 drill in that sleeve, then drill 5/16 without sleeve for tap size. With jig still on start the ream tap, run down till it goes thru drilled hole then use the regular tap to clean up all the way. Remove plate and use the carbide burr to make hole easy for bolt to start.
Backing up put machinist blue at the top of head straight in line with existing bolt. Scribe line, the notch on plate lines up with that line, I did two lines to get more precise. Put a dab of oil on sleeve both are CM 4130 so they won’t wear to fast. Can leave plate on till all holes are drilled, caution, drill bit will catch so go slow and keep bit loose in chuck. If I think of anything else I’ll get it.