I second that emotion. Have had two in recent years; one on a reasonably warmed over 440. Could not get it to quit a slight surging when driving at highway speeds. I tried everything I could think of. Finally put a 750 Holley on the car.

Second one I had was on a warmed over 350 Chevy. That carb worked perfectly, everytime, all the time, no matter what. My son had the car for a couple years and would always forget to put fuel stabilizer in when storing for the winter and it still worked perfectly.