LA heads on Magnum block?

I already have those rockers. How does the oil get from the push rod, thru the adjusting screw, then into the rocker arm, and then to the shaft bearing area? Are the Comp LA rockers all made for this?
strip a rocker apart and all will be revealed. They need to be stripped and all the passages cleaned out if they are new anyway. They rarely get all the chips and grits out from the factory