It's your Vette now. I'll take credit for building it, but I'm actually not the only builder. My buddy Andy put in almost as many hours as I did.
With a good tune and a less restrictive exhaust my guess is 405 at the wheels.
Which Hooker inserts are you talking about? It already has Hooker inserts. You may want to look into the spiral inserts:
http://www.spiralturbobaffles.com/ordering.html