Expect to pay the "Big Bucks" to have a job like that done. Your better off buying a new one. If you read the fine print, Holley only sells "NEW" items custom powder coated.

Most likely your air cleaner is going to be covering the carb, so what is the point of spending extra money to have this done unless your build is trailer queen which I expect its not since you just bought a used carb.

I would just buy a new one would be cheaper and faster.Powder coating it would only be good if its a show car and the whole engine looks great.On a normal car its like buying a 747 for free peanuts.