I recently bought a 1972 fj40, I am going to replace the carb becuase its in rough shape, been sitting a while, the tag on the carb says its a weber. Is that what came on these things from factory? OR is that a aftermarket that the previous owner put on? the little metal tab on the carburetor says "Weber, 74 2F C6" then below that it says "A 80 4". I have no idea what any of that even is. Any help would be greatly appreciated !