You see all these great car and truck programs on TV, where they buy, restore, and flip for big profits. BUT,,,, not many of us can do that. I doubt there has ever been a car & truck enthusiast that has not lost their A** on at least one vehicle.
Nowadays it cost more to restore one than it will ever be worth. It has to be considered a hobby and fun. Been there too. Sorry to hear about your loss, but just chunk it, forget it, and move on.
If it makes you feel any better, I have just invested 8 grand in a project that I will not be able to finish, because of age and bad health. I am not going to worry about the 8 grand and just move on to something more fun,,,,,,