Wow, I knew you guys would come through.
This evening I jacked up the rear of the car and found:
1. There is an inline filter between the tank and the electric pump
2. The electric pump is a Holley blue pump.
3. There is only one line from the tank through the filter, electric pump, mechanical pump, fuel regulator, inline pressure gauge to the double pumper.
4. No return line
5. I turned up to pressure to 6 psi.
6. I ran the car a few miles keeping the electric pump running with no signs of cut out. I think maybe I should plan on keeping the electric pump on.
7. No place open to buy a new spin on fuel filter, but will replace it soon.
8. No sign of a leak around the manifold or rocker covers so maybe the gallery plug is the culprit. In that case, I think I'll enjoy the car a while and keep parking it over an
oil drip tray.
9. Gauges are SW. The tach occasionally fails to fall back below 4500 but a tap on the glass seems to be the fix. Fuel gauge is a little nervous but seems to be mostly ok. I think the fact that it goes towards empty kind of quickly is more related to my right foot.
Thanks again ever so much for the input, it is always interesting and appreciated.