Here are a couple shots of one I did for reference. In speaking on plating colors/types to keep things simple I just call them "silver" or "gold" because some of todays plating colors are accomplished using different methods than the factory used (cadmium, zinc, etc.).
In my experience there are a number of variables when it comes to plating correctness, sometimes individual parts being silver or gold even on the same part# and year carb.
So, what I do is to record the original plating color details of each original (virgin/never rebuilt) carb I see so that I have a good reference base. Most carbs I receive have been rebuilt and the plating is either gone or incorrect which makes these records handy.
When it comes to the body finish there are several methods I use. It really depends on how bad the casting is when received, it's not a boiler plate "one size fits all" process. Sometimes a good cleaner is sufficient while in other cases soda blasting, vibratory finishing, or some other proprietary method is used, especially for really dirty or corroded examples.
The factory cast them in an aluminum alloy which was not coated or finished with anything, however the metal that hit the mold and froze off first was generally smoother and more dense at the surface giving somewhat of a barrier quality.
When a carb is media blasted it opens up the surface pores and if left that way they can absorb stains quite easily/quickly. So, if blasting is used it's a good idea to used a secondary finishing method to peen back the surface which gives it a more correct appearing factory like sheen and closes up much of the porosity which offers a better barrier to stains etc.
I agree with Bill, most carbs don't "need" to have the throttle shafts re-bushed but I add new bushings to them all anyway simply because it's not a difficult process once they are apart and it eliminates any future questions about them being suspect, etc.
