in my experience with 6-paks, 39yrs, stalling when coming to a stop is usually one of, or maybe both, of two things. the idle mixture screws in the end carbs are set too lean or the float levels are too low. i have two cars with 6-paks and they drive very well. the idle mixture screws in the end carbs are between 3/4-7/8 turns out and the float levels are set to where fuel just slightly trickels out at idle. i use 64 main jets on the "stocker" and 65 main jets on the car with a little cam and headers.