Tune up and choke operation are a good start. If you have exhaust gas testing in your area I would suggest taking the car and having the carb adjusted to the lowest emmissions out put poss and still keeping the throttle responce poss.

Have a tune up done. Plugs, wires, cap, rotor. Then time it. You will probably have to have the carb either rebuilt or adjusted. It's also possible that the choke is sticking partially closed. Pull off the aircleaner and see if the choke butterfly is all the way open when the car is at operating temp. Good Luck! Mark