You don't need the idle stop if you are not dieseling. I once used that to cure dieseling on a high compression 1965 Buick Wildcat. The kick-down is needed, otherwise you can't downshift when flooring it. You might be able to fabricate the bracket so the plunger is pushed in by the throttle. It looks like your throttle is bolted on so the right one will just back-fit easily. Sometimes they can be found where they piggy-back to the throttle bracket. There is a spec for when it actuates, like 3/4 throttle or something, which is also when the secondaries should be opening. It is in the FSM.
