The fenders need to sloped at the correct angle, the body has the fenders in an upward position which is horribly wrong, 2nd need to trim the rear window to fit flush with the body.3rd, if using the 429 engine you need to rework the roll cage in the engine compartment. Some other tweeks on the roll cage to make the pieces fit also. If you do this it can turn into a nice stock car. And also you need to sand off the door handles and key locks on the door.