273 rocker arm adjustment

Sounds like a new Bible on this! LOL

One possible issue: I think RR's point on the location and angle of the hole on the valve tip side is different than yours. Your sketch seems to show it in-line with the hole on the pushrod side, and your step #2 describes it that way. I think his point was to angle it so that it is as close to tangent to the rocker-to-valve surface as possible. Your sketch seems to show it at too low an angle and too far down on the side of the rocker body, so that it may well miss the top of the valve/retainer, and become useless.

I am going to make one suggestion and see what RR and everyone one thinks. The valve tips need relatively little oil, and if both of the holes (for both the pushrod cup and the valve tip) line up when the valve is closed, I would be a bit concerned that there is too much flow potential out of the shafts for the flow into the shafts to support. Remember, the flow into the shafts is already restricted in 2 places, so you end up with low pressure inside the shafts to start with. So putting too much flow to the valve tip may take oiling away from the pushrod cup.

So, I think that moving the valve tip side hole on the shaft down a bit would be helpful. Move it down by an amount that is a bit more than the diameter of the hole, so that it is closed off when the valve is closed, but it opens twice per valve cycle. This would regulate the valve tip flow to a lower amount.