Welcome aboard.

That other fellow may have done you a favor. The track width on the '46 is about 4-5" narrower (depending on whose figures you use). If you have the short wheelbase chasis (115"), that would match the '40's era trucks, the long chassis (127"), would need to be shortened.

If you're dead set on changing bodies, the '47-early'55 would be marginal with ugly offset wheels, and the '55-64's would work with maybe just a bit of modifying for length (depending on which you choose)