Then I had the tank done on my 1965 Cadillac, it cost over $600 (maybe even considerably more) and they said that there were holes all over which had to be brazed. No actual missing metal, though, so not sure how they would handle that as it's a bit much to braze.
Yes, they did cut out a large hole on the top which was done along seams to make not show too much when welded back after sandblasting the inside and repairing the leaks. You can just barely see it inside the red lines.
No new tanks were available then (nor are they now) so getting it fixed was just about the only option but I would have preferred replacing it with a new one. Since the tanks are available new for your car, it seems a no-brainer to go that route!
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