why do you guy's like a turbo vs a centrif Supcharger?

Turbochargers also experience lower hp losses associated with higher altitude than superchargers.

Turbos are quieter. Turbos don't have belt slip..

If you look at the sanction racing classes where turbos run against centrifugal superchargers, the turbo cars are always very restricted on sizing and have to run at higher weight than the superchargers. Meaning, turbos make more power.

Look at the fast Outlaw and Drag Radial cars...turbo.

That said, how fast do you want to go? A bolt on centrifugal kit with a pulley change can supply enough CFM to put a half-*** car in the tens.

EDIT: And messing with the exhaust is always the worst part of working on an A-body. LOL

As for me, I like nitrous...