I researched this out a little but still not sure on the year. It looks like the grille is probably off of a ’56, but the truck is definitely not a ’56 because it lacks the wrap around windshield. 1956 was the only year of the second generation to have this feature. Since the grille is not the original, I am not sure how to decipher the year.
Check out the cool spider web chain under the tail gate.