Heavy Duty 1963 Pushbutton 904

That lever has no "positions", no detents. As it moves from the left (idle, low speed) to the right (cruising speed, full throttle) it varies the throttle pressure incrementally.
I am trying to figure out how to adjust it after installing a new intake, 2 or 4 barrel carb, and removing the rod mechanism and replacing it with a cable, (Lokar)