A poster on this site, MAF, has some questions about a 6.3 part he found in a wrecking yard. You have a question about a gas tank from what might be the same body type. I say that because I think the gas tanks are different. I think the 6.3 tank holds more but might bolt right into your car.

Perhaps he could check out the tank for you and you two could work out something?

It might be that when you take out your tank it will be totally clean inside. I have seen this even from cars that have been sitting for many years.

Just a suggestion.

Pooka