Small block mileage

My cars spend a reasonable amount of time on the Interstate. So they all get 2.71 or 2.76 rear gears. My 67 Dart is to nice to cut up for an overdrive, my 71 Polara in my avatar-well, it's just a cop car with a 440 and a 727, my 69 Coronet R/T will get 2.76's when I start driving it again. Anyone of these can run 85-90 all day long if I could get away with it.

^^ This. All my classics spend the vast majority of their life on the highway. Shortest gear I own is currently installed in my Ford 9 inch is a 3.0. Challenger has a 2.76. I actually have a 2.50 sitting on the shelf I'm thinking of putting in the Ford. Both allow me to roll at highway speeds under 3k rpm. Was talking to another Mopar guy at the gas station as I filled my Challenger, he was passing thru from OR and was sharing picks of his Cuda, Duster and Dart IIRC. Guy walked up and asked what mine would pull in the 1/4.. I said I'd pack a lunch... lol. If I tossed in a 3500 stall TC & 3.50 Sure Grip I'm sure it'd do just fine. Sure I'll give it up off the line.. but driving a few hundred miles in a stretch to Vegas or Monterey sure is a lot more fun with a car that tach's under 4k.