383 = no love

Doesn't matter which is faster or more powerful.
It was the reputation the smaller 340 in an A body had in the late 60's,when quite often they outperformed 68 383 Chargers or Roadrunners on the street and the strip.
You can build your 383 to 660 hp but to the guys who lived through that era the 340 will always be their favourite.
And when I a kid, my brother had a 340 Demon. He built the engine and took out everything and everybody. Big Block chevies... didn't matter. As I've stated, the 340 is an awesome engine. However, was the mentality that lame that folks couldn't see why a 3100 lbs '70 Duster with 340 and 3.55's could take out a 3900 lbs '70 Coronet 383 with 3.23's? lol....