Sounds exactly like you’re blowing through the converter. What fluid was in the trans? You could try hygard and see if it tightens up the converter if you just had atf in it.
Those are 273 adjustable iron rockers. That’s a good rocker and about perfect for your application. There are two oil holes in them and you want to run a wire through each one to make sure they’re clear. Then do all the holes in the shaft.
It was just a suggestion, not a necessity. If after 2 minutes of priming with the oil timing lined up on a dry engine, you get no oil, there is definitely something wrong. If you only ran the drill for 10-15 seconds you might wonder “did I run it long enough to fill an empty rocker shaft?”
Have you tried setting the crank at the positions noted above in post 21? As said by others, some aftermarket cams are drilled differently but MOST are not. Set the crank at 90 degrees BTDC on number 1 compression, run drill for 2 minutes. Passenger side should oil. Rotate crank to 20 degrees...