The fellow I bought it from said he had paid some company to verify that it was a "numbers matching truck."
Uh huh. What company could verify 'numbers matching' since there's no such thing? And...FoMoCo THREW AWAY all the records that pertain to these trucks decades ago!
Now, if you had a Cobra, that would be numbers matching, cuz 'ol Shel stamped VIN's on multiple parts.
The numbers on the frame do not correspond to the Warranty Plate??...other than the equipment that it is calling for..?
Compare the 'VIN' on the Warranty Plate to the VIN on the registration, to the hidden frame VIN to see if they all match.
VIN on Warranty Plate is referred to as the "Warranty Number." FoMoCo says it's not for title or registration purposes (it's too EZ to change)...but most people are unaware.
1963/79: Warranty Plate located on the left door face below the latch. People replaced damaged left doors with used doors.
99.9% of the time, they failed to install the original Warranty Plates on the replaced doors.
Since FoMoCo THREW AWAY all the records, there's no way to find out how these 1961/66 trucks were originally equipped.