Jeff, I am going to say that car will be street-able.
There are guys out there that have done a lot more to these types of cars and are very street-able.
7000 miles is a low mileage car. Should be fine for a daily driver.
Jeff,
You have two outstanding shops(livernois and speedinc) that install these blowers in MI. If eithier of these shop did the install, I would feel very confident about the car. Check out ls1gto.com/forcedinduction. Ls1gto has some knowledgeable gentlemen in the FI section. Also, Bob at epp is the man!
You may want to look at the pulleyon the supercharger...that will tell you how many PSI is being pushed on that motor.