Another solution for getting the right throw/travel on the throttle linkage is to shorten the rod that connects to the trans bellcrank on the "upstream" side. That would be the piece that goes from the bellcrank ball socket to the boot couper. Boot coupler is the barrel-shaped piece that allows you to thread in the rod and also slip the rubber boot over it.
Shorten rod #8 in this picture. Boot coupler is #9
