this is wrong and meaningless.
The KD sync has to be done at WOT at the carb, and the linkage rammed as far back as it goes. Where it ends up at idle is of no consequence. Nothing inside the trans is affected until you feel resistance to the rearward travel of the linkage. And max throttle pressure does not occur until the linkage is in the full rearward position, jammed internally to full stop.
Where it ends up at idle, after the syncing, is of no consequence and all that return spring does is keep it from flopping around and rattling. EDIT: see post 47
However, if your VB has a PT KD add-on, then you can use some slack to tune that device. But the PT KD did not come on V8s until 1971.
