Holly carb help

To clean up the cruise and off idle you need to get the idle circuit correct. IMO the IFRs are to big and you need to go down .001 at a time. If I were you I would use a .032 IFR in the bottom position and a .067 IAB as a starting point. Reset the idle mixture screws after motor is at operating temp. If you look closely your rear throttle bores have a .021 hole just below the t-slot to. Set the front t-slot squared up and use the rear to fine tune.