The only way to find out it to bench flow test it. If you do polish your carbs, make sure you clean them thoroughly with lots of carb cleaner! You don't want ro squeek your motor with aluminum residue.
Actually I have seen quite the opposite. Some guys will run a hone through the carb bores to give them a nice cross- hatch finish. I was told this helps to create a little turbulance which in turn is supposed to help atomize the fuel better. I had a set of VM 44's done a number of years ago. The bell was polished to a mirror finish and the venturi was cross-hatched. Seemed to work really well. Dan.
actually the best thing you could do is have a texture in the throat of the carb kind of like the cross hatch comment. A textured surface will flow more air. it dont sound logical but its true. I know gus that sand blast there carb throats with heavy grit sand.