The extra ball on the throttle linkage is not used. My pump doesn't even have a ball in that location (see my photo below).
The electrical connector is the rack position sensor. It's only used for the engine computer to control the EGR and ARV... in other words, it's kinda useless on the 1987 model, once you've disabled those items (which should be disabled, btw, if you haven't yet done so.)
