Fort,
I know that the 60-61 hood was really unpopular, and if you damaged it and required replacement the dealers would substitute a 62-66 hood.
I think it's possible, as Brendan suggested, that the truck may have been late production. It's also possible that it was changed at the dealership for some reason, i.e. damaged before purchase, or trying to make it look like a '62.
In any case, nice truck! I've got a '60 that I bought in MUCH worse shape than that! It's currently without a bed as I finish up the rear frame/suspension restoration.
Brian