It's a good looking car that has "tells" to a serious buyer. You'll lose interest to some (many?) due to the newer seats, but not so much that it's been fed a 428 (still a mighty motor). The engine dress is nice and tasteful but a bit dated for a 69. I think it sits too high, but it seems that most GM A bodies end up that way for some reason. Surely the reason isn't cornering. I love a 69 with standard headlights, I wish it was still gold, I'd like to see it 2" lower so it looked more serious or (no offense) "mature". All of that outta my head, I'd offer that car under $20K, maybe $18,750 obo. If you make corrections you can raise the price accordingly. Do you have the original seats in any condition? Core Strato-Buckets can run $400/pair. Rear frames fit em all and maybe $150 is a lucky price for top and bottom cushions. The average 69 GTO buyer is not very far south of 40yrs old, maybe even older. If you make the car appeal to the right demographic then anything is possible. Last question, and perhaps the most important (expensive), how much mud? How well was it refinished? Hope those few bits of info help.