Dads Barracuda

Got the old tank and filler tube out. The sending unit said 1/4 tank but it was 3/4 full? I think the battery was just shot but I'm going to replace the sending unit, it will never be easier. What a treat. 45 year old parts with Detroit salt and Florida ocean rust. New parts going in. I can't find a decent replacement filler neck so I guess I'll have to try to clean this part. I would rather not put a rusty tube in my new tank!