WIW what's it worth ? model 385 am fm radio 1967 valiant barracuda

Does it work?

If it truly is untested, I'd say $5 - $10.
$100 easy, it's an am/fm, they aren't growing on trees. Even if it doesn't work it fills the hole cosmetically.
If it was untested, I wouldn't want to pay much. That 5-$10 would sound good to me. I paid $100 for the AM/FM in my Swinger. It works but not perfect. $250 is out of the ball park for one that is untested IMO