Like Squeeze said, nice orig tank. I don't get why you wanted to swap it out? take it off, put a little soap and water in it and a piece of chain or socks full of rocks and suspend it on some ropes and shake it all day. Clean out good, fill with water and see if it leaks. Acetone and some other solvents will work if it's real gummy inside. Swimming pool acid helps (Hydrochloric). Don't use muratic. You can get tank cleaning kits from POR/Eastwood and others. They do work well. Keep the stock one if you can, but they are only about 16-17 Gal.
