I have the Dart Wilson on my 408 and its very happy with it. Its almost 14.7:1 with a .748/.668 roller. Had an 1150 on it and picked up with a 950. Right now I have a 750 on it and the timing dialed back to 33 degrees timing and went 10.10 @ 133 on the footbrake. In my truck at 2850 pounds. I had to tame it down, because my truck wont certify. with the timing at 38 and the 950 on it I ran 9.68 @ 137 footbraking, then they threw me out...lol...