My car is worth around $30-$35k to the right buyer. $25k and it would be gone like doughnut at a weight watchers meeting.
I looked at the car you posted earlier today. For a 340 number matching car like that fully restored, top end is $40k...but it better be nearly perfect. If it were a real numbers matching 440 GTS, top end is $50-$60k...but again it has to be perfect.
I have seen a few 440 4 spd cars in really nice condition go for around $45k recently.