The serial numbers are the ones that are most important. They tell you they are '42 heavy duty trucks. The rest or the numbers are just casting numbers, manufacturer stuff, most can't really be decoded or were known to the manufacturer. The 21T-5087 is a part number of that component of the frame. Ford never put door tags, so that tag was probably added at another time, maybe a fleet number or something, but not a Ford thing. Sounds like you have a couple of neat projects there.
'46 Ford 1/2 ton
'07 Black F-150 XLT SuperCrew
plus a handful of other Fords
Are they the original fitment engine? the 42 truck was only 85 or 95 hp,21T and 29T,What is the number on back of block between heads? There is also a number on end of cam,under distributer,That is the cam grind eg 5T ,The 46,7 trucks went to 51T 59T series of motors 90 and 97 hp,I think the mercury engine was the 100 horsepower one,The war one had a relived block? they were a bit more torque but less hp,I beleive the releived block made them flow a bit better and ran a bit cooler,This is not gospel Its just info ive used myself over the years,All the best with your trucks,How bout some photos?
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