For three years in the early '70s, I was half-owner of a '68 Coronet R/T with a 440 Magnum and 3-speed automatic. What that car did on the streets went a LONG way toward financing my college education. (Yeah, including blowing away a couple Hemi Challengers. In the actual Muscle Car Era, those engines weren't regarded all that highly on the streets. Overall, the 440 was far superior.) Personally, I've never owned anything but an automatic since.