I know the cost of these rebuilds can get out of hand, but this is no place for short cuts. I've done 2 partial rebuilds, and I'm a low budget guy, but fuel tank replacement was always a requirement. When I pulled the tank from my 23, it looked better than yours, but I replaced it anyways.
You know that tanks has pits, and there is no patch that will give you peace of mind. Bite the bullet and get a new tank, maybe you can gain some fuel capacity
Be sure to epoxy coat the tank and use these when you install the new tank.
http://boatbuildercentral.com/prodde...4#.U0XpRxZOTdk
Good luck
Lloyd