I have a 68 Satellite with the /6. It's fun although very slow. A few things that I did that made a noticeable difference were; throw a little more timing at it, adjusted the valves, and set the kick down linkage to hold in gear longer. The thing I would like to do next, is throw some lower gears in it. Like 3.23s. But that would mean swapping the 7 1/4 out and that is just more work than I think I will do with the old rust bucket.