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?
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 therg with it....what else could be causing this?es nothing wron

UPDATE: installed brand new oil pump, still no oil to top end.

To re iterate more clearly, absolutely nothing on the motor was touched outside of pulling the intake, putting a timing chain in, and cleaning the rockers/lifts/pushrods, then reassembly.

No cam swap, no cam bearings ext....i dont know what to do now. Rockers are properly installed. Double and triple checked and even turned motor over without them installed at all. Not 1 single drop of oil to the top end.
If your pump works as stated with a drill spinning it , then something is not spinning correctly after installed , you stated you changed timing chain , make sure woodroof keys ways are in place in timing gears ,, gear an shaft to oil pump as stated could have sheared pin on start up ,,or its not in place properly ,, pull distributor cab and make sure cam is turning to spin the distributor when cranking