3:55 gears to 323 gears

When you say highway driving, do you mean 60-65 or does this mean interstate driving 75-80? If just 60-65 3.23's are good. If you do extended interstate at 75-80 2.76 are better, that is without an overdrive. My 71 Polara in my avatar had 3.23's, went to 2.76 behind the 440. I knew I would be on the Interstate a reasonable amount. I could run 90 all day if it wasn't for the patrolman.