The chassis should be flat from the rear to front. Remove the wheels and check chassis for flatness on a set up board or flat surface. If it is bent, you can remove the chassis braces, radio tray, and fuel tank and bend it back. If you race the car on a racecourse, it will be very difficult to remove the all of the tweak from the chassis, you should consider getting a new chassis for the track. If you just run on open parking lots etc, get the chassis as flat as you can don't worry about any tweaks, because you'll most likely hit another obstacle/curb soon.
"Yellow Jacket" Mugen MTX-6, Picco Torque
TeamNITRO RC Club, Lynwood, Illinois