With as meticulous as you are, you should have no problems rebuilding one yourself. Get a good rebuild kit and a float if it doesn't come with one, a gallon of Gunk Carb Cleaner that has a parts basket in it and some old toothbrushes. Make a diagram of the carb, turn the adjustable screws in until they seat counting the number of turns down to an 1/8 a turn and write it on the diagram. Take everything off it except for the butterflies (the screws are staked in place) and soak everything that isn't plastic or rubber in the cleaner overnight then scrub with a toothbrush while it's wet (messy, repeat if nessesary). There are step by step instructions in the kit that go through every adjustment needed and the tolerences. That should get you close enough to get the car running and make the final tuning.
If you are going to get it plated, do so after it's dismantled and cleaned. I have seen carbs with that carb paint on it and it looks fake and crappy. I didn't plate or paint mine and it looks better that a painted one. The problem with zinc plating is the color is a chromate that fakes the look of the original cadmium plating, looks better than the paint but doesn't look correct. Cadmium has been outlawed by the EPA because it uses cyanide.