I have a 427FE & Quaife QBE62G in my GT40. The Dyno registered 715 HP. After 1,000+ miles I have had no problem. BUT..... I run street tires (Avon). I do not do burnouts. When I track it, I will not hit the curbs at the apex of the corners. I do not hesitate to get on it though. You can drive...