I know a guy from where Im from that rebuilds Holleys. He replates them and they look brand new. I have one of his carbs on my cuda. I bet he would clean that up for you. I could find his number for you if you want. He's in northeast pa.
I had my original carb built by Carbs and More in Laporte Tx. It came back in a week and looks brand new. He puts the carb on a motor and adjust before it is sent back to you. Cost around 225 but did a great job.