carb adjustment

Pull the carb off the engine!!! You have something WRONG! If the secondaries will not open all the way (and easily) by hand there is a problem. Until you resolve this DO NOT UNDER ANY CIRCUMSTANCES DRIVE THE CAR!!!! If you don't know why the throttle will not open all the way, how can you be sure the same problem will not prevent them from closing? I learned this the hard way with a Q-Jet at full honk on a twisty mountain road. (In this case it was a defective base gasket).

It is the actual secondary throttle blades and not the air door you are moving with the screwdriver correct? If so, stop doing that before you really ruin the carb. As others have suggested, remove the kickdown linkage first and make sure the carb gets WOT when the pedal is floored. You do have the "Mopar throttle lever adapter" fitted to this carb right? If the throttle cable is somehow attached to the big hole on the carb arm, it won't work. Once the throttle linkage problem is resolved, and only then, do you stand a chance of getting the kickdown set up right.

A malfunctioning throttle is like malfunctioning brakes. Both are serious safety issues. If either cable is frayed or sticking, replace it before it kills you.