not being a numbers car might hurt it a bit, but i was at mecum in indy this spring and nicely restored non se's were going for 18-22K all day long. plus your's has a built 400, 4spd, and t tops and needs nothing. you find a person who loves white and you should get in the low to mid 20's. you let it go to a dealer you will most likely get mid to high teens.
the problem i have found is not a lot of local people have the cash to buy a car like that and you will need a national outlet and even world wide to solicit that car too with over seas shipping being a real possibility. trying to find someone via craigslist in the local greenville area will be difficult. the dealer who bought my 79 last week said it will most likely go overseas, which opens up another set of issues to deal with.
you have a car that you do not have to give away, so get your price.