I would run a compression test to verify the timing chain hasn't just a tooth or two, that will verify compression and timing.
60 psi fuel pressure is certainly adequate, and I understand we have spark...
or, if this still has a distributor (which I think it does), set the engine on TDC on compession stroke an see where the rotor points...
I got stuck one day on a old Camaro with the 70's style EFI and we never could figure out why it wouldn't run...but a new distributor fixed it.
And somedays you are down to slitting wiring harnesses with a razor blade trying to find an internal flaw.
Howard
Maybe ignition.... Mine would just wind, wind and no start til it winded for about 25 seconds. It would do it cold and hot- just at random. Dealer replaced the 'spider' fuel assembly, the system always had adequate pressure, not sure of the psi, but it was in spec after spider and fuel pump was replaced.
By any chance was the truck ever run out of fuel?


but it'll run