Guys, I just went through the exact same problem with my 35 Tudor. The car has been sitting at least 20 years, and I thought it would be a good idea to drop the tank and clean it out. When I tried to break the collar loose from the spout, it would not separate, and after two weeks of penetrating oil, and banging on it, I looked at the cost of a new spout from Macs, and just cut the old one off. From the looks of it, I would have never gotten it apart. It had rusted and corroded until the two parts became one. Sometimes you just have to remove and replace.