Welcome! You're in over your head, just like the rest of us
I don't have much technical experience to share, but even the more seasoned folks will need to know more about your bus to be able to help. Your info says it's a Super Coach. Is it a Crown bus then? I have heard that a handful of Crowns had International gas engines, but I thought it was the "Red Diamond" version.
Whatever it is, it sounds like a cool (but difficult) project! Once you have the minimum 5 posts under your belt, be sure to share some pics please!
Edit: Sorry, I got confused about the engine. Your post says no motor, but your avatar info says "Silver diamond straight 6". I'm guessing the silver diamond is what
used to make the wheels go round and round.