Try using all three carbs like their intended to be run, use the idle circuits on all of them up scope
The stock tri Power Mopar, Chevy and Fords did work shruggy
I've ran and tuned more than one stock 440 and 340 motors with them, I had to use the outboard idle circuits to get them to run good shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)