Its not recommended to drill the number one hole but I, and countless others, have done so. It ain't the end of the world.

The small holes are a waste of time and effort. They don't hold all that much oil and once it starts flowing it keeps flowing. In Dudek's F.A.S.T. hemi he actually blocks all those holes in the galley so that the only oil drainback is at the front around the distributor drive !!!