The Stovebolt Site Forums The Parking Lot Big Bolts 1 3/4" carb on '55 6400?

So, my 1 3/4" carb actually measures 1 11/16" at the throttle plate. After sourcing a local (rebuildable) replacement, it measures the same. I guess all this stuff about a 1 3/4" throttle plate on the 261 is nonsense??? Its bigger than a 235, but not THAT big.
Or is there another carb that I should be looking for???