If you want low down torque go the twin screw blower route, if you want to rev it go with a Vortex. Both are good at what they do, John at John Sleath race cars runs a 4.6 Mustang with a vortex fitted and properly mapped, but he likes the way mine just pulls from low down. As for safe RPM I'd make sure it didn't go past 6k.
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ZT500 Kenne Bell Supercharger, Tremec T56 gearbox, return type fuel system, forged engine internals, custom made exhaust system,
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