No oil to top end

got a bone stock 360 LA with a brand new oil pump in it. Running the motor absolutely no oil is coming to the top end, all the passageways appear to be clear, we blew air thru them,and we even pulled the rockers and ran it that way and still no oil came up.

Pulled oil pan and pump, put pump in a tub of oil and spun it with a drill and it flung oil everywhere like theres nothing wrong with it....what else could be causing this?