273 adjustable rockers on 360, very little oil to springs

the 273 rocker is not going to pump same amount of oil the stamped rockers did. make sure shafts are in correctly. oil holes down and notch to front driver side notch to rear passenger side. now, we installed a restrictor plug @ .100 in each passage, in the block deck. have no wear issues, no galling, no bluing of pushrod ends. they been in there last 30 years.
correct me if I'm wrong, (I haven't looked at a SB oiling diagram for over 30 years)don't the rocker shafts oil off of the cam bearings? If so, if the cam bearings were installed so the holes don't match up perfectly, couldn't that adversely affect the oil supply to the shafts? If I'm off base here, forgive me.