Hi all. I don't want to start a big fuss - - but I just solved the sputtering and misfire problem in my '60 413. It does not like Autolite - 85's. I was carefull not to touch anything else but change to Champion - RJ12YC and now it's running fine. Rich. '58 Plymouth - "Christine", '59 DeSoto, '60 Imperial cnvt, '60 Fury cnvt.