No oil to rockers but have oil to lifters what rmp to flow shafts with all new stuff

VERY LOUD AND LOTS OF NOISE!!! ROLLER CAM LOTS OF OIL PRESSURE, LOTS OF OIL AT LIFTERS,BUT NO FLOW TO HEADS WHEN RUNNING PRIME CAM JOURNALS by hand yes have oil flow to heads !!!!!!!!!but no oil at idle, no oil when revving motor a little, still no oil splash on valve springs, check oil flow again kept priming again and filled heads up with oil just about have lots of flow when line up by hand, flow's very well out every rocker when line up by hand . fire up motor and still no oil to upper shafts and rockers WHAT RPMS DOES OIL FLOW out the shafts. ALL NEW STUFF ps all hughes stuff,eddy heads super prep, roller cam ,shafts rockers ,hold downs ,bee hives springs ,retro lifters, manton cup stile push rods, [blue printed oil pump, p.o.p] meldon pan 936, pick up, REALLY NEED SOME HELP SO CLOSE BUT SO FAR