Good Catch Matt,
I haven't actually seen it in person, just a lot of pictures my in-laws have been sending me. Currently it is at my in-laws place and they are the ones that thought it was a 78. Your probably right with the 76 year. Didn't notice the vent windows until you said something.
The short story on how this came about. I wasn't really looking for another 40 - but as luck would have it - my mother in-law is a realtor who had the listing at said barn find. The people who owned it are moving and couldn't remember the last time it has ran or had moved. A deal was made, and it and the title are now at my in-laws place. I am going up next weekend to get it and bring back to Denver. I actually need another 40 like another hole in my head but I couldn't pass up the deal I got, I feel pretty lucky actually.
Pictures of the 78 that I currently have.