If you took a cam only car and ran it on a dyno and then changed out the heads to LS6 stage 2s and redynoed it when you looked at the dyno sheet would it show a power increase all the way across the rpm range or would it look basically the same at lower rpms and show a big increase at the top end?

 

It would probably make more power everywhere, although the increase would likely be more prevelant in the upper RPM range.