You certainly won't get into 12.x's NA... You'll find a lot of information here and over at the Pacific Audio Performance board. Some of those guys have their Tahoe slugs standing on their rears but you can bet you're not looking at a simple LSx under the hood...
funny....im going for 11's on motor in an extended cab silverado. 12.00 would be easy in a single cab pickup set up correct. go back to your AUDIO performance site and talk about drag racing
old mod list: H/C/I/N/E/G 408
new mod list: 5.3, gears/posi, mufler and tune : (