I have a quick question and would appreciate any advice. I am building a 67, the car has a heidt's front clip, it is mini tubbed with a narrowed 9", it is four linked and has weld-in subframe connectors. the motor is an aluminum headed big block that makes a legitimate 531 hp and 586 ft/lbs. The numbers are accurate as the motor was tuned on a super flo dyno. My question is this: Does the car need a cage? It's not a race car and will be driven on the street. I am however concerned with the car twisting. Any help or advice would be greatly appreciated.