If you want the best 1/4 mile performance, go with a Procharger all the way. For the best street performance and the best low rpm response for coming out of road curves with the torque peak lower in the rpm scale go with a twin screw, not a roots style blower. Whipple has the twin screw kit that I would buy. Ford Racing (Whipple blower) has the edge on computer tuning as far as canned tunes go. Either way, you should have it dyno tuned as soon as all mods that affect fuel/airflow are completed like headers, exhaust, throttle body, etc. By the way, as long as you use the stock bottom end, don't waste cash on an aftermarket throttle body as the stock one is just fine at boost levels you'll be limited to. As far as gears go, 4.10's for street, 4.30's for the track. Aluminum flywheel and driveshaft will greatly improve performance and weight of car, but mostly the car will get up and go much quicker do to less rotating mass.
That MM&FF comparison of the Kenny Bell and Procharger involved my car. If we would have been able to shift faster, we would have been in the 10's. Justin had to shift like an old lady with my new Centerforce clutch, which has since been remedied.