273 rocker arm adjustment
Yes, your red drill line is what I think RR meant and which makes the most sense to me. I did a similar thing on a set of PRW needle rockers. In the 1st photo, you can see how it was jigged up using a 7/8" maple dowel to hold the rocker. The 2nd shows the hole for the valve tip side straight on, and how it juuuust passes the rocker tip on a tangent.
Flow was a constant dribble to the valve tip hole in that setup due to the internal restrictions, and no way to regulate it. Way over kill for the valve tip, but those PRW AL needle rockers had no oiling to the roller axle so I felt I had to get oil there somehow.