have you tried to adjust the outboards idle screws yet? pull the plugs out and adjust the screws,yea ya gotta pull the center to get to the rear,or pull the rear? do a search on the carbs and "dayclona" has a lot of good info!! it helped me on a bird w/ a 440+6 w/ a 509 cam[not my idea] and i got it to idle nice,good luck.
has a lot of good info!! it helped me on a bird w/ a 440+6 w/ a 509 cam[not my idea] and i got it to idle nice,good luck.