I'm stumped, I can't think of any flathead 6's with the manifolds on the right. Ruled out Ford, Dodge, IH, Studebaker, Willys/Continental, Hudson, Nash, Pontiac/GMC and Oldsmobile as all having the manifolds on the right side.
My only guess, and this is just pure idle speculation, is that it could be a Continental industrial 226 and in certain applications they had the manifolds on the left. But that's just a pure wild guess.
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