can't wait to hear the cause.....

Pack the pump with vaseline. Vaseline will dissolve right into the oil without clumping. It is also used in automatic transmission rebuilds.

I have packed pumps with vaseline, poured oil in outlet and turned pump backwards by hand, and also used my cut off distributor to prime a dry pump. All methods work. Look for a missing galley plug.
Don't get me started on the Buick nailhead with the hidden double plug in FRONT of the distributor. Oil pressure to only one side of the engine!!??!!
Ask me how I know...

*sigh*

Ok, so how is it that the pump your buddy uses in the video picks up, and pumps oil, without first being primed? And, as I asked the other gentleman in my earlier post... How does the procedure in the video differ (as far as the pump itself is concerned) from installing the pump in the engine, filling the pan with oil, and spinning the pump by use of a priming tool and drill? Here, I'll answer: it doesn't! The point is that the pump will pump oil just the way it comes out of the box... whether it be from a dishpan on your bench, or from the oil pan on your engine. The pump does not need oil, vaseline, or anything else, poured or placed in it before it will function. That's a fact... Still.

I'm not telling you, or anyone else, that you're wrong... if it makes you sleep better at night to put oil in the pump before you bolt it to the engine... fine. Myself, I prime all engines by means of a priming tool prior to start-up... thus filling the pump, and the rest of the system, all in one procedure... same end result as what is demonstrated in the video.

My original point is still the same: Original poster has a NO oil pressure condition. This is NOT being caused by the fact that he may not have put oil in the pump prior to installation... he's putting oil through the pump after installation by means of his priming tool. In an effort to assist him with his issue, I felt it relevant to point out that this was not likely the problem... Period.

Formula 18, you stated that the oil barely comes out of the remote oil filter. Is the hole where the oil is coming from direct the oil to the outside of the oil filter (if the filter water installed??)

Is there a pressure relief on the boss for the oil filter on the block??? If that is stuck open or missing you won't get much pressure (at the remote oil filter).

I don't think it is a missing gallery plug based on low oil pressure on the SUPPLY from the oil pump. The oil is pumped directly to the oil filter boss through the filter and then to the galleries right? If so it is a pump or tool or pressure relief problem.

Try putting an oil filter directly on the block and try again. That will eliminate the remote oil rigging as the issue.

A dry pump will prime itself. If you pack it with vaseline it will start pumping a bit faster. In any case this is obviously not the problem with this engine.

What was the final answer to the low oil pressure?