Looking for a carb recommendation

4 barrel carbs and most calculators are rated and set up using 1.5" manifold vacuum.

I don't know a single engine builder that builds an unrestricted engine to pull 1.5" at WOT for best power.

Most numbers you calculate, dropping the manifold vacuum to .75", will multiply the cfm requirements by 1.414.

I use those calculator to identify the smallest carb I'd consider using.