Bonjour, Ralph!
Since it appears the data plate is from a Canada-built truck, one of our members from north of the border will probably need to do some research. American and Canadian production code numbers are usually not the same. From the color of the trucks, and some of the lettering that is visible, it appears that you might be dealing with former military vehicles, possibly ones left over from WW II or shortly after. Those engines have an unusual system for lubricating the connecting rods, nothing like the engines from 1954 and newer. If you choose to remove the oil pan and work on the lower end parts, be careful to keep track of any thin metal shims between the connecting rods and the lower caps. They are important for keeping the clearance correct on the crankshaft journals.
Good luck!
Jerry
