any of these sites carry quality parts.
Bronco Restoration Early Full Size Bronco Restoration Classic Bronco Parts For Sale
Early Ford Bronco, Bronco II, Ranger, Explorer accessories, parts James Duff
Toms Bronco Parts - 1966-77 Early Ford Bronco Parts and Accessories for Classic Broncos - New, Used and Rebuilt
Wild Horses The Best 66-77 Early Bronco Parts
BC Broncos - B.C. Broncos Online Store
you can look to get probably around 2-3k for it in that condition depending on how bad the rust is and where. It is not unusual for a restored one to go for over 15k. I would say if you do sell it fix the rust first.
ClassicBroncos.com: Early Bronco Community for 66-77 Ford Bronco
is also a great resource for any questions or problems you may face. Every issue that comes up in the repair has most likely already been dealt with by ppl on that board.
Hope it helps.
JJ