Fuel Tank for 20 footer

[napadave]

The aluminum tank in my 76 20 footer went on to a different life a couple of years ago and I replaced it with a smaller plastic tank. Is having a new tank fabricated my only option or is there someone out there that might have the original one still available? I am trying to decide whether to invest the dollars to do a nice restoration or sell the boat. It has a 87 150 oil injected Merc on it and sits on a 1990 Continential galvanized trailer. I just had the carbs rebuilt, new steering cable and shift and throttle cables installed so the boat runs well but trying to decide which way to jump. Here in the Midwest most people have no clue how a great a boat it is but it is definitely not a bass boat.