Adjusting Mancini Racing Kickdown Cable/Hardware Kit

That's the Bouchillon Performance 3350 kickdown kit, resold by Mancini.
Their instructions are here:
Resources: Kickdown Cable Installation Instructions - Bouchillon Performance Engineering
Final adjustment is just like in the factory service manual, except with a cable.
With the carb wide open, adjust the cable so the trans throttle lever is at the end of it's throw.