74 Duster weight loss program

My friends have 400 Chevys and stroked 408 fords, I'm trying to beat them with 40 less cubes to make it bitter for them! I know I could have used. Lighter car to start with but I scored this one foe $250 so I bought it and built an engine and tranny for it and threw gears in the 8.25 that was already in the car.