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Here is what customers have to say:
..”The first thing you will notice if you turn on the supercharger manually using your car battery is that it will want to fly away, like a JET engine. It is very power powerful and unlike any other electric fan you have seen…”
They are trying to pack more air into your engine using a motorized fan. The fan requires 900 watts of power to run which has to be supplied by your charging system. The correct way to do this is to use a turbocharger. Check those out.
Milling the head or shaving the head will increase the compression ratio thus increasing hp and torque. If you're going to shave the head you might as well hog out your intake and exhaust ports, add a lumpier cam, and add headers. The better an engine breathes the more power you can make.
Personally, a SBC or small block Ford will give you a bigger bang for your buck.