I have them on my 69 Dart. I onlt have 11 runs on this car to date. Best so far is 10.50 @ 126.24. With a 1.47 60'. The car has a 4.56 Dana and a W2 416 engine. I'm hoping to lower the 60' this year. My old car weighed 400 lbs more and had a 4.30 gear with SS springs. This motor and trans ran 11.08 @ 120 with a 1.52 60' in it. Jim