Attempt at test running a Magnum

TT5.9mag said

Get a fuel pressure gauge and screw it to the fuel rail test port. (Napa auto zone etc) they are picky about fuel pressure. Fix the leaky regulator. I had to ground the jtec ecu (2001) on my test stand for it to be happy. If you have fuel pressure, and the ASD relay is powering injectors/coils AND the fuel sync hasn’t been messed up it will fire.

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Thanks for suggesting this. I was thinking along those lines, to see what the pressure actually is instead of guessing.
I have a spare regulator. And I tried pushing on of the grounds onto the PCM case with no change. It would be easy enough to ground it.
The fuel sync is adjusted by moving the distributor and confirming position through scanner/tuner, right? If so, the distributor has been moved.