If the idle falls that hard with just the load of the AC, I’d think the carbs are on the lean edge.
Ross brings up using the secondary carb, makes sense but you’d have to make a bracket for it I’d think as the pad on the throttle shaft is different than a generic throttle lever.
As long as you are fabbing parts, makes sense to do it on the driverside and just use it to push the linkage.
Interesting situation, I never considered having to do it. Now I kinda want to make something lol