Hi buck, is that one of the old military hobarts?
If you've got any pictures, that may help. That has a 6 cylinder engine right?
If so it may be one of the continental engines. f-227 maybe?
Unfortunately i know very little about the hobarts, but i love the looks of some of them. They never seemed to have the popularity that the big lincolns did outside of military use.
I'll keep looking, but i haven't found much yet.