You wont save anything or gain any power because the amount of energy required to drive enough air through the radiator has to come from somewhere. If you add an electric fan ,it will cause resistance in your alternator and make the engine work harder as it has to make more electricity to drive the fan.
There is no such thing as a free lunch.
There is not much you can do to make a 3F run more efficiently.
You could try an electronic ignition kit, it will give you a better spark. But I doubt you would notice the difference.