Pretty darn sure I have the wrong carburetor on my '67K. I am in the early stages of restoring my "kar" and pulled the motor a few weeks ago. Obviously, the carburetor came off first. Over the years, I've visually compared the carburetor to all available pictures in Tony Gregory's books, and it has (up until today) appeared correct.
However, after pulling the carburetor, I was able to see the casting/part # and date: C5SF-B and date 9-20-64, which from what I can glean from the internet is not correct for my "K", but instead for an early 390 motor.
This carburetor has a 1.12 stamp on it, and as per the book photos, lacks the hot idle compensator. Bores also measure out correctly @ 1 9/16" All correct manual choke pieces are there, and the motor always seemed to run well with this carburetor.
Any information would be appreciated - thanks!