454 Mystery

[lo72]

Ok I'm building a 30 over 99 454 using a zz502 roller cam lifters and 3/8s pushrods. New melling hi volume oil pump rings bearings etc. Now here's the problem I've primed the engine and I'm getting oil to the rockers on the drivers side but nothing, zip,nada to the rockers on the passenger side I turned the motor a number of times. I'm getting good flow to the drivers side but nothing to the passenger. I'm using an electric drill 800 rpms max. I have 40 lbs of oil pressure. I'm really stumped! Any help will be greatly appreciated .
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