How good is the new Hemi, REALLY?

well there is a guy at BBD and i think i saw him here he goes by the screen name MomsR/T. he has don alot or work with them.. says the 5.7 is a better motor to build.. he is running carbs. and has some in the 10's from what a recall.. he says they are awesome motors. he also says there is a ton of small things you can do to really make them run... see if you can find him here or at BBD and talk it over with him....