Carter Double Pumper?

I was reading along on the Thermo Quad thread and this came to mind. Do any of you have information on or ever see a Carter AFB / AVS type carburetor set up as a double pumper? The main body is cast with a pump well on the passenger side and the screw pattern for the hot idle bypass valve on the secondaries looks suspiciously like a place for a squirter nozzle. I have seen a diagram of an AFB double pumper but never seen one for real.