Cruzmisl,
The figures in your chart look about right. Somewhere around 350HP with a bolt-on supercharger, adding about 100HP from stock.
If I ever hit the lottery, I'm going to get a ZZ572/620 installed.
http://www.greenwoodchevy.com/engine15.htm
Klaus
Rare 2003 H2 with UM8 Integrated Navigation Radio
Skull & Bones Member since 2003