My next bracket motor, 400 block, 4.300 stroke, Indy CNC ported 440-1 heads with Jesel paired rockers has both pushrod oiling and spray bars,no restrictors except what is in the covers with the fittings they come with.
These Jesel rocker arms come with hollow adjusters with no provisions for pressure oiling the shafts, roller tips or any thing else
I called Jesel about this and they insist that splash oiling from the pushrods is more then enough to oil this system
I haven't ran this motor yet, I'll post more about it after I put it on the dyno or in the car