I have a 68 GTO with a turbo 350 trans & a very tall rear end a 2.56 open. I am looking to buy another axle or 3rd member & go to a 3.08 or 3.23 rear end posi. Some folks are trying to talk me into a 3.55. But I drive this car all the time & want to keep it as a driver. Meaning some actual multiple hour trips. Will I be unhappy going to a 3.55 as a driver? I live in CO where often speed limits are 70-75 mph. Note: eventually I will put a M-20 Muncie 4 speed in but that is down the line. Thanxs for any feedback.