Is there a place to get a new or refurbished tank?

My current project car is an '86 GT that sat in a barn for 10 years. Apparently, the person put the garden hose to the filler door because the tank was full of water when I dropped it out.

New sending unit, new fuel pump, but the interior of the tank is covered with rust and I'm not liking the thought of putting all this new stuff into a rusty tank.

A good radiator shop should be able to clean it up for you. The car I purchased sat for 10 years and the PO tried cleaning it themselves and then using the liner coating, which just peeled off and plugged up everything later. The radiator place I took it too charged like 60 bucks and looked like new inside.