Whats it worth - 70 340 Swinger Basket Case

I recently watched an H code 340 4 speed Duster sell locally at an auction. Was a running, driving car with nice paint (factory lemon twist) that someone had put a 383 in. Still had the front disc, 8 3/4" rear, had the rear leafs moved in but not mini tubbed, rally dash. Original bench seat car someone had scabbed some buckets in and needed carpet. It was a very solid start that needed someone who was willing to spend the time on it. It brought $5900 and the new owner drove it off. I would have to agree with the other responses that $5k seems awfully high for as far apart as you describe it.