My first car, in high school in 1968, was a used 1963 Dart with the Slant-6. It had 85,000 miles on it, and I drove it until 1980, when my income level allowed me to pay cash for a brand-new car. It had 405,000 miles on it by then and, while it definitely showed its age, it was still running. Great car.
I had a slant-6 Dodge Lancer, push button transmission. It ran great for a lot of miles in the couple years I had it.