I spent a lot of time with Holley on the phone and looking at their charts. On their suggestion, I installed a Holly 570 CFM Street Avenger. Couldn't be happier. I had to modify my cable/kick down mount by also using part of a later model mount to handle the kickdown rod and lengthened the rod with a piece of threaded stock and a threaded bushing from my local True Value. It all works beautiful. Other than that, the carb is just about as plug and play as it can be. My Dart is my true daily driver and it fires right up every time whether it's in the twenties on a winter morning or over 110 in our summer afternoons. It runs beautiful. Very responsive. The only difference in our set-ups are headers on mine.
https://www.holley.com/products/fuel_systems/carburetors/avenger/street_avenger/parts/0-83570
