What they are suggesting is a bracket that corrects the angle of pull on the TV cable for the 700r4 tranny.
Bowtie overdrives sells a high zoot very adjustable unit.
Summit also sells a detent bracket that bolts onto the carb that corrects the pull angles and travel of the cable pull.
The cable on the 700r4 is not a kick down cable , it is a TV cable. The Throttle Valve cable tells the tranny when , what , how to shift with main line pressure control
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.