I sold my 1970 Challenger A66 car about 2 years ago for $9,000. Mine was very solid to start but had all metal work done. It came will redone seats, new fuel lines, brake lines, carpet, the numbers engine was rebuilt and detailed, suspension was all rebuilt, new tires, It was burnt orange on burnt orange basically needed paint and reassembly. I started at $12k and after a couple of months finally sold it for $9,000. So I too think you should've grabbed the $9,000. Good luck.