I think you are the fellow. That had the nice black 65' coronet. We talked to you about installing hoses on the vent tubes. We also enlarge the pump shot hole to help with a car that stumbles like yours is. Larger squirters might cure it as well. Also have you tried running it on the front two barrels of each carb? Might rule out a problem or find a problem with secondarys. Might try a set of mechanical secondary carbs to see if it solves the stumble. Poppaj