Need. Photo of 66 273 auto carb linkage

Cosgig- “lock up at full throttle”
Am I understanding that if you hammer it hard it will do what I call “over camming” and hold the throttle open? Is this what you are referring too? And Thank you for your comment. And “Yes” I have the complete set up for the behind the head mount set up as described for 66’ formula S.

yep, that’s why that style was discontinued in favor of the slider bar that rides on the stem at the carb.