Yeah, I really like kenne bell blowers, but on the push rod motors I like the centrifugal style better. Plus these little 302's are pretty torquey motors as they are so they don't really need the bottom end grunt of the twin screw. They seem to really benefit from the top end charge of the centrifugals.
Procharger supercharger are awesome! The fact they come with such a big air to air intercooler makes them great and consistent. Vortec has an after cooled kit that's awesome, but like the procharger kit you'll have to relocate your battery to the trunk. The after cooler really only pays off with lower intake temps if you keep fresh ice in the reservoir tank. In my opinion any of the centrifugal kits have better max potential then the twin screw.