72 demon 340 number matching drevetrain

Hey Kid: Whether you realize it or not there is a vast amount of knowledge here on this site and many do know the true value of most of these cars. Of course the value of something has a lot to do whether or not one can find someone looking for that type of unit in the current condition. When that happens then an exchange will usually take place. For some that are not familiar with the current markets they usually rely upon publications such as i do to determine the going price of something in todays market. With that being said, i rely upon "Old Cars Price Guide" and on the car you are offering at a price of $15000, they reflect a much different value based on previous sales whether auctions or a private treaty sale. The values listed in their book is as follows.
#1 $15000 = Show room condition, trailer queen
#2 $10500 = Maybe mistaken for a #1 car, very good
#3 $6750 = Good amateur restoration
#4 $3000 = Drivable car, all components needing restoration
#5 $1800 = Restorable, needs complete resto, may or may not run
#6 $600 = Parts car

So from the pics you have shown us and the above description of the guide i'm placing your car in the #3 to #4 range but more towards the #4 range. Did you get a pic of that K member for us? Don't feel let down. Everyone is try to assist you on marketing your car and like you, most of us here have way more in our cars than we could ever get out of em. Great hobby.
Small Block .....and don't call me .....GALEN