Re: 5.7L Hemi Supercharger???
Well, I will say this. GENERALLY, the guys who truly have deep enough pockets to fund major projects have enough upstairs to know what is and isn't worth doing. Adding a supercharger to an existing engine is one thing, but there are swaps that just don't make any sense, like some of those suggested here. There are any number of shops out there that will make big promises either out of pure ignorance or outright greed who lack the ability to deliver, but will be glad to take your money.
Back to the supercharger thing. I have NEVER seen a modern car with an aftermarket supercharger or turbochargers on cars that did not originally come with them that behaves as well as a factory tuned vehicle. That includes Dodge Challengers, BMW M3s, Audi S4/S5s, Chevrolet Camaros and others. Even if you don't have major problems, like blown engines, there are ALWAYS some nagging issues, whether it is throwing belts, transmission problems, tuning issues, random MILs, whatever, you just can't beat a factory developed vehicle. If you want a toy, and are willing to pay to play, go for it. Just know what you are getting into.
One BIG word of advice. If you do go into a project like this that you cannot do yourself, do not be the first guy to pay someone to do it. The guinea pig is the one that pays for the learning curve.