GT is a sweet car. They had 1 for a short time at my local Ford dealership, but I think it was just doing the rounds. Sweet.....
I misposted the Sledgehammer's top speed by the way. It was 255 (254.76 to be exact). I remember reading an article in Road & Track on it back in 88 when I was in High School. I had to look it up again after I posted.
http://www.fantasycars.com/derek/cars/sledgehammer.html