Need help NON mopar 1967 Pontiac Lemans 326
Get a plug without a black shell.
That thing is pig rich at idle. If you listen carefully it may oink when you blip the throttle.
Ok....that was just uncalled for. I apologize. Seriously you need a different plug w/o the black shell and work on the tune up. If it's that fat all the way up you are giving up a fair bit of power and a huge bunch of drivability.