our se auto w72 one owner car sold for 26k in one day on ebay, probably could of gotten more but i bought it for 16K off local craigslist. had great paint but there was rust repair prior to repaint in qtr's, and tail panel was poorly repaired, other than that very nice but standard interior with factory non air car.
a fully restored driver condition car 4 speed should get 30k-high 30's, frame off should get much more. ours was a hardtop and that hurt us some, but the new buyer did not care.
i saw a nice 78 se at mecum last year go for over 60k because two people were fighting over it, all the other bidders stopped at around 40k.