No, because gasoline containing methanol is not generally available, and the carburetors used in the A-body era tend to be just fine in as-manufactured form with the 10% ethanol in most US and Canadian gasoline (ethanol is a whole lot less corrosive than methanol). Ethanol-related carburetor problems tend to crop up with "remanufactured" carburetors that have been abrasively cleaned—sandblasted, etc. This strips the passivation coating off the castings, leaving them very vulnerable to corrosion induced by alcohol and the water it carries.
But the gaskets in a NOS BBD aren't going to dissolve in today's gasoline. The float's brass, so no problem there. The accelerator pump will usually be fine, too.
