Howdy back Nick:
The carb you reported (C6AZ-9510-AS) does not show up in any of my reference manuals. In 1966 the carbs used on full sized Ford cars with a 240 six were Autolite 1101s, coded C6AF. The 9510 part of the code is Fordspeak for carburetors.
An 1101 from that year would read C6OF.
As Mustang6 mentions there was an 1101 used on 223 sixes in full sized Ford cars, that has a SCV, but that was only in 1963 & '64.
To the best of my knowledge a 1100 was never used on a 240 engine from '66. IF you have the carb, a photo and throttle bore diameter might help unravel this puzzle. As far as using on your 200- 2hat year is your vehicle? Things like carb hole diameter, bolt spacing, fuel lines, linkage, vacuum needs, and air cleaners woul need to be considered.
Keep it coming.
Adios, David