Serial number is 3131405992, my finger slipped and added an extra one. As for the engine number it seemed that someone had had punched the numbers C661580 as they were not uniform in depth and not in a nice line like a manufactorers tooling. The tag on the states the engine number as the same but the aluminum tag was rivetted on and I had read somewhere that the original ones were screwed on. This truck could have been put together as you stated. Thanx for looking for me...