It's real easy to throw numbers around. He may not be interested in taking on a resto project ( a lot of shops are not, as they move slow and take space that quick insurance jobs could make more profit in ) or he's looking to see how hard you flinch.
That said, I just put a ton of money into a non-matching 400 4 speed convertible because the car is exactly what I was looking for. With today's market prices, I could have bought another car completely done for what I put into just the car and bodywork outside of all the other resto work, and could have had the car on the road for two years.
If the car runs and drives, it'll sell, so shop around first and see what's available, consider selling with a nice cleanup, and enjoy your driving time.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching