I'll be doing this in the spring to my 74 cuda. I have decided to replace the tank. I priced out the materials to clean and seal the tank, and then to paint it. The cost of a new tank for this I've seen as low as $159+shipping.The cost to restore is about $100. If you figure in the time and hassle, it makes sense in this case to replace it. I also agree that part of the fun of this project is to try and restore everything, but I think this is one area that I don't want to mess with. By the way, what do you do with your old tank?