The pivoting sub frame is not uncommon at Bonneville even today. It works for that purpose. But a lot of people think solid mount works as well or better. Looking at results I can only say that there is more than one way to skin a cat. And they all work, when they work. But I don't know of any street driven cars with either. It would be OK cruising the fairgrounds I bet. Hitting the freeway for Memphis, maybe not. Depends on what works for you.