Judging on that you don't know the car's true power you haven't had it dynoed. Has it been street tuned with a wide band? If it hasn't thats your answer. But i dunno about 430 rwhp at 8 psi from a supercharger on an LT1. I'd guess more like 400.
What trans do you have? Dont underestimate the power of a stall. My turbo car sans stall wasn't a whole lot faster than a full bolt on car with a 4000 stall.
2000 SS Camaro