How bad is your tank? Rusted through? Take it to a fuel tank/radiator repair shop and see what they have to say before giving up on it. It may cost you some serious bucks, but in the end it will be worth it to have your original tank.
My tank was totally rusty inside, dented, and a baffle had broken loose and was sliding around inside. They cut the tank in half, pounded out the dents, re-welded the baffle in place, de-rusted it, welded it back together and then coated the inside with some cherry red sealer.
Best money I ever spent, haven't had a problem with it since.
