Good idea on spinning the engine. There is a flat on the rear cam journal that allows oil to reach the rocker shaft only once with every revolution of the cam. So, if the flat wasn't aligned with the oil passage, when priming the pump, no oil would go to the head.
Also, the lifter/cam lobe face is only oiled by splash/mist and won't receive any lubrication until the engine is running. So, it is very important to use lots of assembly lube on the cam.
I also found that the rod used to drive the oil pump should be a close fit in the dist. bushing or oil will tend to gush up around the rod.
Berry