Okay, good to know. So I guess there is only the second number, the one that gave me "1961 Flint Michigan" that remains a mystery. 1360003814
I know the motor is not original, as the ad says it is a newer 235.

The Cab seems differently shaded than the hood and fenders, and I'm wondering if this is result of a repaint, or just different formulations in the original paint that weathered differently? http://www.callingallcars.ca/Trucks/Truck_info/48chevy2tondumpwbhr598.htm