Ever heard the term "worth more in parts than it is together"?
My '65 is like that.. I probably couldn't get 4000 for the truck together, but could easily surpass that and then some, parting it out.
The odds of someone liking EVERY SINGLE mod done to the car, the mileage, the history, and the condition are slim. but SOMEONE will like the motor, someone else that door, etc. Its just a fact of life.. You can get over it, accept what you can get, or you can hold on to it and wait it out for the best offer of a lifetime.