Ran these carbs for nearly 20 years all street driving, they were on my 440 when I found the car - different linkage than the one posted. After rebuilding the carbs, they worked flawlessly, instant throttle response with the accelerator pumps and adjustable to where you wanted the outboards to come in. I really mean my 440 was ferocious with the cam, headers, torque coverter that I had in the car, loads of laughs. Great carbs.