If you are running head studs, did you open up the head bolt hole(s) where the oil comes up from the cam to the rocker shafts?
I usually also make the lower rocker shaft hole where the oil feeds into the shaft slightly larger too.
With the regular shafts, oil should flow around the hold down bolts no problem.
On my 360, I also grooved the #2 & #4 cam journals (small groove) so the rockers get some oil all the time.
On my big block T&D rockers they use a smaller diameter thick wall rocker shaft, and the hold down bolt should be machined down a bit for oil to flow around the bolt, otherwise the bolt blocks the oil flow through the shaft.