Head gasket has nothing to do with it. Rotate the crank slightly by hand while turning pump and see if that helps.
If you hook up a drill to the oil pump and crank it, you should see oil coming up to each head, oozing out the ends of the pushrods, onto the top of each rocker. I don't think there's a way to install the head gasket so wrong that would prevent that.
Perhaps your drill doesn't have enough "ass" to get the oil moving. Used to be when I used 10W40 racing oil my 3/8" drill wasn't up to the job. It took my 1/2" Black & Wrecker drill to get things moving.
Sounds like you haven't run the pump long enough. Run it with a drill for a minute, then rotate the crank 90 degrees and repeat. It's probably just filling up the lifter galley on the left side.
Ok it took ran the pump 1 min then rotated crank 90 deg 4 times. R side was pushing oil in 45sec
That isa a nice graphic layout. I have saved it for later reference, and inserted this into the For Shop Manual PDF files I have, in the engine lubrication sections.
It sometimes take a lot longer than expected. And if you have a second pair of hands, have somebody continuously rotate the engine while you prime it. Can you tell if the lifters are getting oil filling them?
If you choose there is no need to pull the engine; "just" drop the tranny, bell housing and rear engine plate. You'll then have access to the rear oil gallery plugs. BUT may be best to pull the engine for a thorough tear down/inspection of the rear oil cross over route.
