5 years later, replace the fuel tank or clean it?

5 years later, replace the fuel tank or clean it?

If you put a crate 360" in a '65 Barracuda that's been standing outdoors not moving for 5 years, would you replace the fuel tank and line, or take it off and try to clean it somehow? (I'm on the left coast and they get nervous when the dirt from your fingernails hits the ground). Or is this something that must be cleaned professionally? I haven't checked out new ones so I don't know if I can get one... Thanks.