One other thing: As the lifters oil through the pushrods and are fed by the oil galleries that pressurize the hydraulic lifters, you accomplish nothing by rotating the crank while preoiling, unless you rotate fast enough that the metering valves start letting oil up through the pushrods.

The regular LA way of oiling the upstairs was by oil that traveled from the camshaft up special passages through the block , then the head gasket up to the head up into the rocker shafts and then through holes/banana grooves into the rocker/shaft interface. The oil supply from the camshaft was metered by the camshaft journal which had holes in it so the oil only actually traveled intermittently when the hole in the cam passed the hole in the cam bearing up to the rocker shaft, that's how I remember it anyway.
R.