I was under the impression when I bought my car it had 3.91's. Going through the paperwork and putting together a timeline of all the work that had been done by the previous owners I in fact have 3.23's which I'm happy about. I plan on doing a lot of highway driving in the Spring to car cruises so for me that is the best gear. My tires are 25.4" tall. I also have a 727 transmission.
The question of how much driving you plan on doing on the highway is something you need to ask yourself.
The question of how much driving you plan on doing on the highway is something you need to ask yourself.