Ron -
67 and 68 essentially used the same system. Minor changes exist with brackets, wiring and system release designs depending on if you are looking at a factory or dealer installed system in either year.
The Cruise was operated through a vacuum servo mounted to the firewall that hooked up to the throttle arm, not directly to the carb. It was accuated by a button located on the end of the turn signal knob on the steering column. I have seen two designs for this. I may be able to confirm which is correct for 67 but will need a few days if you need to know.
Illustartions are available in the Assembly manual under UPC K30 in 67. I only have documentation for 1968. I am not positive as to what the differences were between the two years as I have not inspected a true factory 67 K30 in person. However, the two major components that make up this system (the servo and regulator) are the same.
-John
