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Chassis is stamped in 2 places. 1 is along the top portion of the frame right around where the alternator would be, 2nd is only visible with the cab off. These should match the door tag but sometimes doors are changed and id plate are not.
edit: Technically not "numbers matching" though as ND stated above. Sometimes, even when original, the #s don't jive. My #s match exactly except that the frame shows an F100 and the door tag an F250
GM's Numbers Matching wheeze: They stamped VIN's on engines, transmissions and rear axles, so if you buy...for an example, a '69 Chevelle SS, you want its VIN to match all the powertrain VIN's.
How many Fords from this era had VIN's stamped on powertrain parts? NONE!
It makes it tough to know what parts are "correct" though, sometimes. My '64 has a deep Truck oilpan, but the drain plug is the large 7/8", I think it's from '57? At some point drain plugs were 1/2" no? Just different stuff that makes ya go "Hm." Truck also should have had a PCV system, it has a single road draft tube out the back of the engine.
I want to confirm my truck is numbers matching. Where are the numbers located? Thank You.
The only thing you could do on a Ford that old is find the casting/engineering numbers and the casting date codes to see if they are correct for your build date. The date codes are the easiest to sort out. They should be before your build date but not years before. There are plenty of internet sites that show how to read them. Even some of the body panels have date stamps on them but you would have to dissemble the truck and strip it to bare metal to find them.