To Much Cam?

A line loc is designed to work on the front brakes. If you lock your front brakes, unless you are running slicks, I can't see you being able to load it up to 3000 RPM (or anywhere close to 3k for that matter) without spinning. Even if you did it would probably just push the front tires. Don't know if they'd work on the rear wheels very good or not. The brakes would have to have some super holding power. My car has the best 10x1-3/4" shoes I could find for it and they'd never hold the car back even at part throttle but my car is real torquey. A trans brake is what's needed and maybe what your thinking of.