Alan, you could be on to sumit there.
I dug around and found the pic, it's in Mac Hills pickup book (page 80) 1939 pickup chassis part shot dated 9-20-38. It has hydraulic brakes, the carb and manifold are real clear (94 on an aluminum 97 type manifold) not sure the pic was ment for the public, due to the dust on the rails (they would have at least wiped it down) , empty cardboard Box Sat on the rail, mucky torn paper covering on the steering column. Just looks like someone took a pic of it sat at the factory.
I'd still like some confirmation on the correct manifold for Kehughs truck, and for me, when the manifolds were changed, with the carb mount divorced. As this apparent cross over of manifold/carburetor designs. As I said, the early type will burn out a power valve on a 94 type carb. Is not in some kind of judging standards?
Thanks, from me and the op, See if we can get this nailed down. As it seems the accepted correct for year manifold ain't a good match for the correct for year carburetor!
Martin.