69 340 having oiing issues

Thank you all very much, just when you think you know it all someone comes along and educates you. I did not know that the oil was not a constant flow? I thought that when you pre-lubed the oil should come out constant, but it didn't come out at all yet when cranked over without plugs it pulsed out, which I couldn't understand. Yet even so the shafts don't seem to get enough oil. Maybe cam bearing spun partially enough to restrict amount of oil. And I believe the shafts are in correctly notch to rear of engine on passenger side facing down, the drivers side is opposite notch down and to front of engine. Already cleaned out both shafts with solvent and air pressure. Neither looked dirty. I expect oil to be flying all over when running engine w/o valve covers but almost nothing coming out anywhere. Just wanted to know what to take apart first. When I cleaned rocker shafts also cleaned each rocker and made sure all oil holes in them were open. I have read in here somewhere about rocker shafts with an oil groove in them, would these type shafts help? I am getting tired of buying gaskets lol.