C6OF-AC is a good number. Probably a 1.1 inch venturi model. Not sure about the '67 model year, but a C5OF-AC was equipped with a #62 jet and was the application for a 200-1V TAXI.

 

Stupid me, I miss read the calipers in a hurry just before dinner. It is 1.2".

After some closer look I am certain it is a bastard carb that came off a rebuild line or something. The top and bottom colors are not right and the vacuum closer thing next to the jet is a ball pulled up by a bent and flattened metal rod. The early tops (my guess) have a bent rod into a cylinder shaped piece with a cone to close the flow.

 

According to the '67 shop manual C60F-9510-AC is for an automatic transmission without exhaust emissions. Used with the 200 on the Mercury Intermediates, Cougar, Fairlane, Falcon and Mustang.

Throttle Bore: 1.437
Venturi: 1.200
Jets - Normal: 68F, Altitude: 66F
Spark Valve Color: Plain
Choke Spring: TP


Of course who knows how much of that still applies if it's been rebuilt and pieced together?

 

I just recently bailed out on the 1100's I have been using (fighting). threw $ down for the universal 1bbl from vintage inline. I must say it is a pretty good carb so far, and has been trouble free. But it ain't cheap.