I once was charged with the care and feeding of a fleet of old iron for a private school. Among the buses, lawn mowers and a couple of tractors was a 52 GMC 350 or 450 dump truck powered by a 270 that went to the garbage dump once a week. It must have been the first digital truck -- the throttle was either wide open (1) or idling (0). The only time your foot wasn't on the floor was when you shifted gears (there were 10). It was slow and the roads were hilly. It had no vacuum advance. It had no gas mileage either. But it did have vacuum wipers. We tried not to go to the dump in the rain.
Remember these old things had positive-ground 6-volt electrical systems. That has tripped up more than one wrench turner, me included. Make sure the battery polarity is correct and if not after you correct that, you may have to re-polarize the generator and regulator.
