It is a International Harvester, Scout 800, made between 1965-1968.
Really cool machine, will climb a telephone pole, or my old one would....
I was built with Delco electrical, Ford drive train, Chrysler, or Dodge motor, usually with over sized heads to give more power.
Mine had the Chrysler 727 transmission in it.
On the funny side... Don't pay any attention to the plug numbers stamped into the intake. International changed the firing order on the engine.
I learned that one the hard way...
Probably a GM fuel sending unit is close.
Good luck with it.
Mine never let me down.