I wonder if taking the valve covers off and removing the intake would be another option. What if they were removed and you poured oil all over the rockers, shafts, cam, lifters ext. You guys think you could get enough oil in there?
When I put oil in a new build, I take both VCs off and pour oil all over the valvetrain and then prime the pump, and put the VCs back on and fire it up.
The cam/lifters are covered in assembly lube, so I don’t think it would be necessary to pull the intake on a new motor. But if you are the OP or have a used motor, that might not be a bad idea, and it allows you to make sure you’ve got a good seal on the intake.