Heres an article on a vairety of camshafts and their effects one could expect to see up and down the scale. After all, for starters, it's a camshaft the LS3 seriously needs...
http://www.gmhightechperformance.com...n/viewall.html
The next article is a bit dated, but shows real world numbers when swapping out the stock LS3 cam for a streetable upgrade. The numbers are for just the cam swap alone...imagine if one were to upgrade the intake plenum, throttle body, and MAF to compatible range around 102 MM's, increase the injector volume, and use tuned exhaust manifolds (round tube)....
http://www.gmhightechperformance.com...ral/index.html