Arizona Swinger
I think you're about dead on...with as much quality work as you've put into it, that's probably a fair estimate of what someone would pay, and similar to ones I've seen that were auctioned off with similar builds. It was a 340 car that's been completely gone through, so on the upper end, *IF* you were willing to part with it, and found the right buyer, perhaps a little more.
Too bad it can't be worth the sum of it's parts and labor, but hey-you made it the way it is to enjoy, not to sell :)
EDIT: The last one I saw on eBay that underwent a similar restoration wasn't a 340 car...it was a 360 add and was in a similar hue...I think the guy sold it (eventually) for $26k...