From what I've seen it also has vvt, not a huge deal but it's something to be aware of. Those LS3/L92 heads make crazy power with no porting at all. Add a decent cam and you're basically in the 500hp range, but make sure the injectors support it and have a proper tune. You may make slightly less hp than with a carb, but you'll get better mpg.
Well guys I dyno'd my new setup yesterday, its a L76 6.0 with Ls3 heads and a healthy cam. I am very pleased with the numbers. Converter was locked during pulls and cutout was open.. Here is a dyno vid, graph, and idle clip. Sorry vids were takin with phone so the great quality... Track...
www.ls1truck.com
Remember that's at the wheels too, so imagine what area the crank numbers are in...