1964 Valiant "Get Runnin & Drivin"

The industrial application of the Slant 6 on the John Deere Swather had the big maniflolds. Talked to the guy about it when I sold him the replacement slant 6. Unfortunately his big manifold was cracked, so he just used the truck manifold on his application.
Not sure how to go about a search,but back in ole Missouri there are lots of old combines out of work many with that slant six. I am thinking Gleamer combine also. That and the 2 bbl intake I have bought them back there for $75 for the pair, but shipping wold be $100 !!!!