On your deal I would look at a Thermoquad or Quadrajet type carb. to get the small primaries with the larger CFM rating at WOT, you will need the correct intake manifold(stock 1972 and later 440 intake
This.
I have an 800 CFM Holley spreadbore carb on a factory cast iron intake that is my go to combo. The carb has been attached to the intake for the last 25 years and I use it on my stuff or loan it our for others to use because it runs so beautifully on stockish 440s. Then I wrap it back up and put it back into storage until the next guy needs it. Throttle response is great, mileage is better, and power is as good as anything except a 6 bbl.
