69 barracuda; what's it worth?
65 valiant...
you didn't say "what kind of car" you are looking at - a fastback, coup or convertible.
a "rough" non-driving fastback could range from $1500 to $5000
a "rough" coup would be in the same range as a fastback
a "rough" convertible is probably worth a little more - say $2000 to $6000.
without more information and PICTURES showing body style, motor/trans, rust issues, parts missing, original valuable parts still in place, etc., it's impossible to give you anything but a wild guess.