Carb related for sure. Its an old V8 tuning trick: If the engine is idling with choke off, and you close down your idle mixture screw it should die. If not she's running too rich or has another carb problem.
Check float level, accel pump shot, loose main jet, needle valve, etc.
good luck
chip
BTW, where is Jeanerette? I grew up in Hammond, me.
