1960 Valiant Restore: advice welcomed.

I have to admit to having owned many Mopars over all these decades but on one 62 Lancer. I got it maybe 10 years ago and yes the tank was history maybe? or maybe I found a repop NEW tank that fit! Don't remember! Yes I do, I found a new one!!! Was it for a 62 Lancer? I doubt it! NOS? I doubt there is such an animal.
Me, the conservative type, I hate to throw anything way that can be salvaged/ Problem with old 60 year old tanks is the metal can get really thin in spots and get a pinhole. I have patched with all kinds of things over the years, some worked better than others, but NON as good as a new tank!!I would try to fin a repop tank that will work, unless YOU can fix the old one where it does NOT leak!! Leaky gas tanks are dangerous!!