Stagger...
May I suggest you put a little time and money into your GTO before you sell it? Most people just want something in really nice condition with no "problems" and in very decent "cosmetic" condition. They'll pay top dollar for it because they either can't or don't want to do the work themselves. They want it the "easy way". If you doubt my words just ask blueovalz here on the HZ forum. He ran into the same issue with his absolutely gorgeous one-of-a-kind V8 conversion when he tried to sell it without the drive train.
BTW, this goes for just about anything else you may want to sell. I dealt on fleaBay for a long time and I have a pretty good understanding of how people think. I can guarantee that a little know-how, some time, and a bit of elbow grease will net you much bigger rewards than just "letting it go". People will pay big money for "nearly perfect" but shy away from "pretty good". The only people buying "pretty good" are those looking to make a profit by buying your "pretty good" item and making it "nearly perfect".
Again... it's just a suggestion.