This is the best I can come up with for now. Hopefully someone with a 39 will see your post and take a detailed photo for you.
The first illustration is from the 39 fact book but it doesn't identify if the engine is a six or eight or which carb. With the hump in manifold I think it might be an eight.
The photo is from the archive and identifies as a 39 six but the angle and distance in the photo is such I cannot tell if the straight piece is a tube or linkage. It does appear to be connected in the area of the choke housing where the threaded port is as is illustrated in the WA-1 rebuild information.
The opening for the stove appears to be on the side of the manifold in the fact book illustration and if that is a tube in the photo, curving into the side of the manifold on the six. Both stoves may be the chamber type.
The third item is a postwar manifold illustration showing the typical construction of the tube thru manifold type stove.
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