Is this the right one?

In 1966, the kickdown rod was not slotted. It was solid with a threaded end at the carb.
Yup, totally different setup of yours is stock. '66 uses a big bell crank plate assembly that bolts to the back of the driver's side cylinder head. The rod going forward to the carb is two pieces, and has a socket connection to a ball stud on the carb. Do you have the stock AFB, 904, and the rest of the kickdown linkage? Photos?