No oil to top end

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.
Then why in the WORLD replace the oil pump? That action alone shows you're not even thinking.