When you put it on, make sure the throttle is held open by a brick or somthing on the pedal. Then put the coil on. Turn it slowly by hand tell it closes the choke plate lightly. If it's too tight you will have problems. Loose is fine. Tighten up the screws. Remove the brick, install the wire and turn on the key. Check for power. If that good then reach down and hold the throttle open and look at the movement of the choke plate. It should only take about 45 seconds or so to open. If that works then set the high idle after starting it.
Let us know how it goes. Keep in mind only rotate it the correct way, otherwise it won't close the choke.