68 dart sedan worth

With a major heavy hart. My dad is in the hospital & he is in very bad shape. My sister & I are going to have to sell some things. Now his 68 dart sedan has a rebuilt 340, 4spd, all new interior, newer tires (about 300 miles), a lot of new stuff. I know its not an original 340. (they never made them) The body is pretty nice. Someone put a rt. half quarter on & its not very straight. My question is what do you think we can get for the car ? It runs & drives really nice. I know what he has in it & I know you don't all ways get what you have in it. We want it to go to a good home. ( when its time to sell it) Thanks

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