so i have a working propane
furnace that I jut pulled out of my 71 boler
1300. It is not the original furnace, but is an 1997 Atwood Hydroflame II 8912
(12,000 btu), a good furnace and the company is still selling them and offering parts and service.
I know it fit and worked in my trailer. Even if you are not interested in the furnace I could send you a couple photos to get an idea how it was installed and where. One of these photos show where it was located in the rear dinette , you can see the brown cover, it vented directly outside.
anyway I am in redoing my 71, and I have some other parts that I do not need, maybe you have parts to trade or just need some misc piece of hardware I wont use or bother selling. I think we are in the same neck of the woods