reading this link I get the feeling that the hyper shifter is an after market purchase.
The OE is looking for info on the stock part throttle kick down. Not sure when it started but I know early 70s. I think 73 but not sure.

(quote)I know the newer transmissions use a kickdown cable instead of the rod linkage.

Cables were used on 65 and older trannies, just use your regular kick down linkage rod, but know that they are specific to 2 or 4 bbl carbs. the later part throttle K/D can be retro fitted into early transmissions, very easily.