Chris, I know this is an old thread and not sure if you’re still doing research or not - but I thought I’d chime in. I have an old TD9-91 with the IHC D350. It starts on gas, then switches to diesel. You can control the compression ratio with a lever 6:1 to 17:1. No glow plugs, you start on gas to warm it up, then flip over to diesel. 350 CI 4cyl, between 60-70 hp. has carb, mag, plugs one side and injection pump and injectors on the other, really throws people for a loop! These engines also came in old IHC tractors, power units, etc… It would be a cinch to run these on gasoline at 6:1 and then flip to wood gas at 17:1 CR.