4 doors are notoriously high in both NADA and Kelly books..... To the right guy on the right day that REALLY wants the car, I'd guess that you might get 1/2 of the "low" figure...... IMO it'd take a MINT 2 door hardtop to bring the "average" figure, and even then you'd be back to finding the right guy on the right day.... Nothing personal to anyone, but my observation over the years is that the collector types who would even want a 4 door aren't going to pay anything even resembling a reasonable price.....