I am rebuilding a Carter 4 barrel model 3921s from a 1965 401. Everything is going well except I need to find 1 part. If you look straight down the carb throats, there is a flat cooper strip with a "nipple" on it called an exhaust temp idle compensator valve. It appears like it lifts up when warm and lies down covering a port when it's cold. Anyone know where I can get one or does anyone have a parts carb they would sell me the part? Thanks, Tom..
