Jon, I have one stovebolt engine with an updraft carb setup- - - -not sure of the application, but if you can share some pictures of the ones you're researching, and where to look for ID numbers, I'll be glad to do a comparison. Since my need for such a carb is somewhere between "slim" and "none" you'd be welcome to it- - - -no charge!

Edit: Are 2 barrel carbs with the 90 degree air horn configuration for military 270 GMC engines worth anything? I've got a few of them.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!