The lever that hooks to the trans off the carb should be "Free" moving....It'll have a small shaft sticking out , w/ grove machined
in it to put a e clip to hold kick down lever on the pin....If you hold the lever foward,opening the throttle,it should be "Pushed" back as the throttle is opened....and return to the front with lite pressure when you let the throttle close.On the trans there should be a lever sticking out where you would hook the kick down shaft...As far as findind the right kick down shaft ,good luck....I think that they used a cable toward the "End" off the c-4 production,maybe you could make the cable set up work ???
Its been a long time seens I saw one up close,l don't remember any thing else,sorry !
