Well, I sure appreciate all the help on this truck. Nice to have the numbers all defined and know the engine.
I'm just getting ready to drive, pending dry roads here.
A new experience for me today, when I found the last owner had put the plug wires in the wrong order! Amazingly, it had started and drove onto the trailer in Cal, though it ran inexplicably badly.

Funny, it wasn't backfiring, but it was wired, I believe: 1 4 2 5 3 6.
So, there you go. Got it straight and she purrs now!