Focusing on the fuel system. A new tank was fitted back when the transfer case was.
To avoid the factory plastic lines and uncommon fittings, as well as hard-to-diagnose leaks that can plague lift pump suction method of fuel delivery, I decided on using an electric pump at the tank, Continental USA-made R7 fuel hose, and simple barbed fittings.
I had a hard time determining which fuel pump / level sender harness to purchase. No photos of the various possible part numbers were available online and Autosparks had no equivalent. The curiosity of which part number correlated with which harness was killing me so I just purchased all four possibilities. Two ended up being NLA but the remaining two arrived, both obviously very old stock. The left harness was clearly for a diesel where only a level sender is present. Fortunately the right harness had both the wiring for a level sender and for a pump. Mystery solved.
I couldn't decide between using an in-tank 2.5 petrol pump with the filter sock removed, or an external Facet solid-state pump, so I opted for both. The 2.5 petrol pump is elegant in that it mounts to and is fully contained in the tank. I cut off the factory Rists 3-way round connector and replaced it with the proper Lucas spade terminals and covers to mate to the factory harness.
The Facet pump was also fitted with the correct terminals and hose fittings, and then mounted behind the tank with very strong magnet bases. With this arrangement it serves as a spare that's ready to be quickly and easily swapped to at any moment.
With the plumbing and wiring complete I filled the tank with a few gallons of fuel to test the pump.
Success