Adding part throttle kickdown 904

how much less pedal do you need for it to kickdown. when doing my trans i forgot all about wanting to do this. i was more worried about the low gearset and forgot all about it.
I recently got the PTK kit from A&A. It was originally sold for the slant 6 valve bodies and works great on the pre 1971 valve bodies. Cannot put the part throttle kickdown piece from 1971 and newer valve bodies onto the older ones though. The A&A piece works great and I've used it myself. I installed the Fairbanks Transaction shift kit into all my automatics. When set up with this shift kit, I have my part throttle kickdown shift from 3rd to 2nd about 1/4 throttle at 25MPH. The PTK is a must have for street driving in my opinion.