73 I had with a 340, this one was just a little hotter than stock.
There were several 340 Darts, and a few Dodge Demons the Plymouth Duster running around, I always felt the stock 340 motor was pretty snappy. Especially the ones with 4 speeds. Not sure about the Darts and Demons but the Dusters, some of them had bigger motors than the 340-360. They all went away around the mid seventies when the EPA decided to kill the muscle car market.