After 33 years of high RPM cruising, I changed my ring and pinion to a 3.50 gear set. What a joy to drive now!
All this time I thought I had 4.56's as that is what a previous owner said he installed, it turns out they were 4.11's. I debated between 3.89 and 3.50, the 3.89 would't have been much of a change. Lesson here, make sure of what you got 1st. I got lucky on this swap.