[1956cameo]

I don't think I will be of any help, but I do know that I used to have a 1954 chevy truck that had a ruined frame because of a bad clip job. We had a rusted out 1951 truck that had a good frame and combined the1954 sheet metal with the 1951 frame. Due to differences in the changes made over the years the bed sat about two inches too high. Possibly you have an older frame with the 54 sheet metal. However that is just a slight possibility since it doesn't seem to sit as high as my bed did; and I assume it fit properly when you took the truck apart.