If you put that VIN into our VIN buster -
http://www.stovebolt.com/techtips/vin/vinbuster.html - you get this:
1948 (October) 2 Ton 161 inch wheelbase built in Tarrytown, NY.
Either the cab has been replaced with that one or the truck ain't a 54 or 53.
Where is the gas tank located? In the cab? Or inside the frame behind the cab?
You should have a split windshield and no vent windows.
Do you have any pictures?