That's what I'll do. I had to replace the gas tank on my '65 Ford about 25 or so years ago. I put a stainless steal tank on it and won't ever have to do the job again. They cost more than double, but, like the Ford, I plan on keeping the '61 at least 30 or 40 more years.... I would suggest just replacing the gas tank. They're not all that expensive and they're known to rust out. It's not a terribly hard project, either.