Slide carb. will have a little better response because there is no transition between the idle and high speed circuit, but you have to everything else behind the carb. up to snuff in order to make full use of it. Ports, manifold, cam, valves, etc. If you are using a close to stock size carb. then you would do ok without having to re-invent the motor, But if you want to use one of the monsters then you will need to do some work on the motor.