56 Napco

[Jeremy_5]

I am going to look at a 56 Napco that is for sale. I have been researching these trucks for a while, however information for these trucks isn't as abundant as I thought.

It seems pretty easy to tell if its a napco, with the very rounded diff. and if it does in fact have "Napco" stamped on the housing. But since you couldn't order a chevy from the factory with a Napco conversion until 57 how can I tell if it was originally in fact a Napco?

Any one have any tips of what to look for? Was the only engine avalaible a inline 6? What other options were available? Did they offer a flat bed from the factory? A duelie? Any info like this would be a great help.