Super Six Idle Issues... Bit 'O' Help Please!

probably a vacuum leak.........
but also on the butterflies on the 2280 if its a 318 carb sometimes it will have holes in the butterflies which will cause it to idle a bit higher no matter if the idle is backed all the way off , i usually put some screws in it self taping drill screws. Holley 2280 is the better two barrel, Better economy Carb, and it doesnt get throttle shaft wear like the BBD.