I would agree that 6-8 is a more safe estimate for daily driving. Good gas is key, but 10 lbs will slowly hurt the motor. Finding one used is just about the best idea. I just bought a complete used Novi 1000 kit with IC for $3k. Also, Ebay works great for finding parts.
My 01 should be making 450 rwhp with 8 lbs and the IC. Any more than that(combined with my 4.10s) and the car won't hook on the street at all.
Matt