As someone who has replaced a tank on an '84, I would recommend pulling the tank now and getting it over with. It might pressure test ok now and leak gas sometime during the summer with a full 60 gals in the tank.
In hindsight, its not that hard to pull the tank.. When you're doing it, its a pain. When you are done you say "oh thats it?" and you get to see what 30 years of salt does to aluminum. Mine was not leaking but it looked scary down where the foam covered it.
If you pull it and it looks good, it'll be easy to clean out and put back in. And you won't be worried about it.
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