So just how good was the A-Body back in its day?

Back when I was a kid two guys in town had 69 Darts. 1 340 Swinger 4 speed the other was a GTS 340 Auto. Guy's would come from other towns with Big block Nova's, 383 Road Runners ect...These guys never got beat by anyone. These cars left the biggest impression on me that I will never forget.