Running one in my pink 71 duster. Stock 3.31 stroke .040 over 340 10.7:1 ported Eddy's that flow 275 @ .600, strip dominator, and 750hp. cam is on mild side .550 lift w crane gold rockers. Running 3800 stall w 3:91s hooks and goes nice. Little ticky, but a blast to drive. Was dynoed @ 450 hp