Afaik, Jesel doesn't make any specific adjuster for spray bar oiling. They pretty much assume the rockers will be pushrod oiled.
A .020 hole for each lifter/rocker would certainly be plenty of oil, especially when you consider how little oil can squeeze through the area of a proper edge orifice oiling set up.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads