If you just theoretically suppose that a supercharged 01 and a factory blown 03 were making the same horsepower and torque, then the 01 would have the advantage in curb weight. I also think that the 01 might have a slightly better initial torque multiplication from the gearing, but of course the T-56 probably would hold its RPMs better. I'd bet with similiar traction, the 01 would be a few ticks quicker. When you consider the possible lack of longevity of the 01 and the factory warranty of the 03, the difference would seem hardly worth it.
How great it would have been to have an all-aluminum engine with the weight of the 01 with the factory-backed horsepower numbers of the 03! The more neutral weight bias of the 01 mixed with the power of the 03 would probably had the Corvette guys really sweating it out...on the strip or road course.