I had a '75 Duster with a stock 318 and 2.45 rear gears in high school. Even the weak sister 2 bbl. 318 did a decent job around down and would boil the hides at will.

Where it really shined was a hilly 30 mile section of road that I traveled to a neighboring town most ever Friday night. No problems with 100+ mph sustained speed and the a/c running cold the whole way.