paxton supercharger on a 440

I am looking to put a F1 on my car and convert it over to the street.
I was directed to go no more than 9.5 to one with water injection.
Get my solid roller reground and a couple other things.
The biggest hit is getting rid of all of your N/A fuel supply system.
I was quote 7800.00 for a complete system (no engine work). My ears just about fell off, but again that is for 1K plus HP on pump gas.