there's superchargers for the 2003 s10 with a 4.3 but i've seen no turbos, you can find the supercharger at www.superchargersonline.com you should know where to go from there.
the kit from machperformance put his blazer into the thirteens, with the right traction setup, a dime can be put into the low 13s to high twelves with it. i believe the price for the kit is 4500.