John, I'm coming in a little late with this but, I had a 62 New Yorker with a single 4 barrel carb and I had a similar problem back in the mid seventies. I took it to the Chrysler dealer in Kutztown, PA and, if I remember correctly, they put some kind of baffle in the carb to settle down the gas. I don't remember the details, it was about 25 years ago, but I do remember getting the invoice for the work. It was $22.00 !! It almost broke me! Mark Souders