Since I'm going with the AOD, I am probably going to change out the rear end. The car is a 68 with a mild 302 and currently has a 3.00 ratio. I figure with this OD would only be good on the highway. I am leaning towards a 3.55 to 3.73, probably the 3.55. Fuel economy is important to me since this is my driver, but I do want a little more than the 3 to 1. So do you guys think this is a good selection?