Can't help directly, but we were able to convert the carb on our 1972 Chevy pickup from automatic to manual choke with a conversion kit from the auto parts store. You have to learn how to work a manual choke, including to shut it down as the car warms up; but nothing generations of drivers didn't learn. If your state insists you keep meeting smog tests with your vehicle, that won't work; but, if you can make the switch and don't find a reliable used part, you might consider that.