Engine Rebuild oiling problem

[WB72]

Hey all you mechanics,
I just rebuilt a 350 and am having an oil issue. I am in the process of reinstalling it in my C10, and while I was priming the oil pump, I noticed that I am getting oil only to the drivers side of the engine, none to the passenger side. There is definatly oil pressure, I have no idea why there would be none coming for the whole side of the engine.

I have tried running the oil pump while rotating the crankshaft slowly, but no oil. Is there anything else I should be looking for?

I have pulled my pushrods and made sure that I can blow through them, you can, and there is oil in the bottom of the pushrod.

Yes, there is enough oil in the crankcase.

I am lost for an answer, hopefully the smart folks who watch this board will help!

Am I worried about nothing, is this normal, or should I wait to install untill the problem is resolved?

Thanks,