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The carb body is pot-metal, zinc based, I believe. Boosters and air horn are aluminum, venturis are pot-metal. All are subject to corrosion. I think you're only choice would be to have the carburetor body electroplated. Maybe nickel or rhodium.
You could do zinc then nickel then silver.
From a metallurgists point of view, lots of options. None are cheap, and the longevity of any of them are questionable, but it can certainly be done.
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