Uh, pretty sure the idle speed did not kick UP with a/c on those, too early. The solenoids supplied on those cars would be a type that the upper hold was for normal idle and they only can DROP idle, not increase it. They increase to the upper step ONLY when the throttle is hit to unload them, they cannot push hard enough to jack speed up by themselves and not intended to. The lower rpm step when power cut allows the throttle to close fully to stop afterrunning or dieseling, all they were intended to do. I have '80 model 2.3 and all it had on it as well.

They became throttle 'kickers' when they started being incorporated with a vacuum cylinder, that was the first throttle kicker Ford used that could bump throttle up by itself without relieving the throttle by hitting it. Around early to mid' '80s or so when lots of engines began to show up with them. That type will have a vacuum port on it.

I wouldn't, all you need there is power to work the solenoid. Usually bad solenoid if anything, they get weak and won't hold the idle setting. They even when new will not bump the throttle UP, they only snap up when you press throttle doing anything and then do not go back down until powered off. Need a good ground off the carb of course.

The vac portion works on dead stock engine but any engine mods can make that part no longer work right. Lower vacuum from older engine won't even work right. A real sucky method of boosting idle there, they didn't use them very long in practice. Myself I'd defeat it and manually bump up idle to be able to cover both speeds on and off. Or use an all electric solenoid.

That looks to be all electric...... ....