After rebuilding my original 2bbl carb for my '70 Malibu, I noticed after removing all the soot that the front portion (the front of the steel mounting base) has had some rust build-up over the years. I found out that this was common for the two-barrels. What could I treat it with to prevent further rusting when it goes back on the engine? Would Por-15 work? It isn't exactly a high-temperature area like exhaust manifolds, but it does get hot in that area. What would work?