Spray something on it while its running to see if idle changes . You don't neccesarily need to use something flammable .
Why not run the brakes off the carb with the hose from your 83 ?
You may need an adapter for the metal tube for some carbs , but some you don't . If I remember right the factory metal brake hose adapter threads right on to Edelbrocks , and use a small adapter for Q-jets .
Run the tranny off the x-mas tree on the back of the intake , and cap the unused lines .