You have problems at both ends. As suggested above, contact Bouhillon to see if they can provide you an adapter for the carb end and a kickdown lever. If not, you will have to improvise something. Fab something on the carb linkage to move the attachment point further from the pivot point. This will give you more travel for the cable. I would try to find a stock unmodified kickdown lever and go from there. Try to match the travel distance at both attachment points. Good luck!