I was thinking about doing something similar. What I have drilled now should at least fill the right-side galley, but I have considered tapping the other side to fill the second galley on the points side. When Logan and Kiley did their 360s, they did it a little differently I believe. I know on Greta, Kiley made a rail and tapped both sides of the rocker cover at an angle directly above the outer journals. Logan only did the right side. When he and I talked about a plan for this one, we decided to move the tap up to the flat side of the rocker cover, which will pour oil through the rockers and into the galley. Regardless, it's bringing another avenue of oil to the top end, but how effectively remains to be seen.
I have not drilled the cam.