Attempt at test running a Magnum

Thanks again for the great responses! I got it running! It was a combination of problems with the fuel system.
First thing was to check for pressure.
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Well there's your problem, no fuel pressure.
I didn't have a spare pressure regulator like I thought. What I had was the Dakota's original returnless fuel rails. So I put those on, and rerouted the fuel lines into preset regulator and filter assembly. It came with the Classic Performance EFI conversion for A bodies. I know it's a GM part, I think for a C7 Corvette.

Still no pressure after changing the regulator. I assumed the van's gas tank would have a sump area and the gallon of gas would be enough for the pump to pick up. There is not a sump area and the gallon of gas was only a 1/4" deep. So plan 3c.

I put the van's pump and sending unit in a 2 gallon bucket and poured enough gas in for the pump to pick up. Cycled the switch on a few times and it built up pressure. Pumped up to 55 psi and held, so I cranked it and it fired up.
It runs very rich and didn't want to rev up, but I think it's because of the cobled together exhaust and the fuel sync being out. I'll post videos once I figure that out. For the time being, here's a picture of the rat's nest minus the steering column. For some I thought the screws on the ignition switch were not removable. They're torx with a pin in the center. Just needed a torx bit that has a hole in the middle.
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Also, the tach doesn't work. When I started messing with the van's gas tank it was pegged past 6K and wouldn't reset with cycling the switch.