The truck you have is very rare. However, it is not practical to use. The 371 makes a lot of noise, but very little power. It has about 25% less hp than a good running 302 gas engine. The 22M was the smallest of the twin screws with the interaxle drive shaft over the top. That whole idea didn't last very long because they were aimed for vocational use and were not strong enough to handle it. The heater may be a South Wind heater. You might consider leaving the rare truck in its original state and finding a 450 gas burner to set on a later model chassis.
