If an ms3 car makes the correct amount of power it should trap around 120 cam only. Every car is so much different. I know my car Cam only with spray would make a pullied cobra look like it wasn't racing. It would take a twin screw cobra to run with/or pull me. There are definitely some dogs out there on both sides.Well, with stock ls1 heads your bro's car should be in the 118mph range... with heads in can go to about 120-122mph.
With a 100shot, cam only with full race weight he should give you a sick run, if it's working that is!