I have a '66 hipo carb for sale.
Tag reads:
C6ZF-C
B 5JD
It definitely needs to be rebuilt as the rear accelerator pump lever is broken. Also, the choke mechanism isn't done correctly. However, this is a real hipo carb as it lacks the hot idle compensator and has the choke stop cast in. 6ZC is stamped on the foot. The only other blemish, other than being dirty, is that one of the mounting holes appears to have been overbored.
I can email pics to those interested. If it doesn't sell here, its off to ebay.