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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I would go with the KB. The instant torque/boost. The level torque curve. Very easy installation. and stealth of it. As long as you don't pop the hood, no one ever knows it there. The centrifugal types have the slight whistle at idel. Sitting at a stop light and someone wants to play, they have no idea what they are in for until it is too late and they hear that whine!!!
Of course I voted for the Procharger because that it what I have. I love hte way it looks, I love the way it sounds, and I love the power it produces. As stated above, any one of those would be a really good choice. The thing I didn't like about the KB was how soon it built up boost. It may sound dumb, but in my application, if i was at full boost at 2k RPM I'd be losing traction all day. I'm much happier getting full boost at around 3k RPM with the Procharger.
No matter what route you go, you're gonna end up with a VERY nice HP gain and you're gonna love it.