I have a 66 oldsmobile 425 that I am running at Holley dual feed carb on, (either a 650 or 750 not sure). I think I am getting close to getting the thing tuned in. The only little issue I am having is once and a while (not all the time) if I stop at a light or let of the gas for whatever reason when I return to acceleration it will stumble for just a second then clear up and run well. Any thoughs as to what may be the cause. I know I am close to getting the floats adjusted right (bottom of the sight plug). Dont know if the floats could cause this problem anyway. I have also adjusted the a/f mix screws as well so I know thay are close.. Could either of these two adjustmenst be causing this problme anyway? Any other thoughts?