My 64 Barracuda would do 140 mph and be quite stable. No bodywork or gimmicks. Basically stock Formula S suspension with the best HD front end parts and bushings. Get your front end down, I adjusted the front end so my closed fist, about 4 inches, would just clear the lowest point of the K frame. Shorter high speed tires all around. Wheel bearings adjusted to spec on all 4 wheels. Spring clamps on the front of the rear leaf springs.
Have to agree with safety, at 140 mph you need to be able to see waaaaaay far ahead and to the sides. When I would run that fast, it was in South Dakota on a flat stretch with wide clear shoulders and no sight obstructions. I also knew If something bad happened, I probably would not survive. I would not drive that fast where I live now.
