ive been buying and selling gts darts for 20 years,if as you described with a fendertag 7k to about 9500 is a fair price they made just over a 1k 340 4spd gts cars in 1969.
The guy who has it is a life long mopar fan. I work with his brother and he is asking 7500 but said he is very negotiable so I say 6500 to 6700 isnt ouut of the question. I will take pics tomorrow