Im going to be building a stock cyl 4 mil drag motor. goin outframe pipes in a lightened stock chassis. I am hoping for mid to low 4's if possible. I am wondering if an override is necessary or not? If so which one? I will be running 300 ft sand maybe the occasional dirt but very rarely. Also not sure about carb size? What would you guys suggest? I am right at 3000 ft elevation. Any other input on setup options are greatly appreciated. This will be my first drag motor.