Tank you very much: advice please

There is logic in replacing the tank sight unseen if the car has been sitting decades with the cap off. They are not expensive and it would be cheap insurance for everything down stream.

THAT BEING SAID...

my 67 Dart sat in my mom and dads garage with 1/2 tank of So Cal 2013 gas in it for 4 years, not started once. I expected to have to replace the tank, fuel lines, fuel pump and rebuild the carb . fast forward to the day I got it home. a squirt of starter fluid and it fired up and kept running.

years later I had to replace the filler neck seal so I dropped the tank. And to my surprise it was clean a whistle, even the filter sock was clean. there are a hand full of rust spots but nothing bigger than a dime.

moral to my story...

Have the shop pull the tank being careful not to damage it and inspect it yourself. maybe is salvageable maybe not but then you will know for sure.

same thing goes for the fuel lines I just pulled the fuel line off of a 67 Dart that had sat in a field since 1976. I assumed it was trash so I cut the sender end off. after I got it out it was in excellent shape at least on the outside.