I have used rocker arms from my 59. The guy that did the rebuild over 30 years ago was a hack and he let his friends use his shop. Some of my original parts were lost. He replaced the missing rockers with some that were incorrect.
The correct one should have a hole in the rocker where the pushrod seats so the oil will flow up the rod and into the ball and cup area. I have one set that has the hole but they aren't all located in the exact same location. I suspect he hand drilled them. The other set does not have the lubrication holes. There is also a difference in the geometry.
I also have the balls that seat into the rocker. If you are interested in sorting these out, contact me.
Mike