Regarding the repair, I have purchased years ago 4 damaged, leaking, rusty and crushed tanks. All were sent to Dave Thibeault who returned them like new. He has a contact who takes them apart, hammers out all the expansion and contraction dents, re solders and paints them correct.
I recently sold 1 of the 3 left to an Avanti owner in Miami. He was and is still trilled, even though the purchase was costly.
I strongly suggest contacting Dave Thibeault, he is a wonderful source of information, parts and knowledge. Though he has not helped with me trying to buy another car with my wife, she feels I have enough toys.
Mark