When I was in college, I ran a 1958 Chevy Del Ray coupe with a 235, a 3 speed, a 3.70 rear end, and 14" tires. I had no trouble keeping up with traffic on the brand new interstate highway system, and in Tennessee, the speed limit was 75 at the time. The idea that the RPM is too high with a direct drive transmission and that setup doesn't make good nonsense.
jerry