3.23 to 3.55?

I have a 3.23 open 741 in my 4 speed 68 Dart. I am switching to a sure grip. I think I want to go with a 3.55 gear. Any members here make such a switch? I just drive around town except for the 2.5 hour drive to Carlisle every year. Are you happy with the 3.55 gear? Thanks FABO.