I would advise you to go no smaller then 2 1/2" pipes....and 3" would probably be even better. You're going to need that engine to breathe. The last thing you want is backpressure with a supercharger. I ran a smallblock with small diameter pipes with a blower in the past...I blew it up. It matters more how much you can evacuate from the engine then what you can force into it.