look on the back of ur alt. theres a lil wire comin off it that goes up under the intake mani. it used to go to the factory carb but wont reach to the new carbs choke. you probly cut it when you took ur old carb off. you should be able to just pull it out from under ur manifold and put a female plug on and onto ur choke. its just a lil bigger than a speark + clip. mine didn't come with one so i had to run to parts store to git one.
you can see it in this picture. just a lil yella wire.