Where have you been living, under a rock? He used to have that shop over on E Street. Man, some people just never bother to learn their cars history.
Seriously though, it's all a matter of timing. Before listing it for sale I would try to hunt down someone attempting a full restoration of one, that'll fetch you top dollar. Start browsing some of the Boss Forums, most likely someone is very hungry for one.
Yeah, your best bet is for someone restoring one. You'll need the date codes to get top dollar, but that's the route I'd take if I were trying to get rid of one. The block alone is probably worth half of what a new R302 (or whatever they are these days) is worth, which is probably around a grand.
Thanks for the replies and tips guys. 5K $ is about what my other sources say, but of course it all depends on how desperate the buyer is. Unfortunately the engine isn't mine, it's in a 66 restomodded fastback I'm considering buying, but I think the engine should go back to an original boss and be replaced by a custom 347 or similar.
I bought our '65 coup for $3100. It had a 1969 Boss 302 and a Toploader. I took the Boss out and put in the Cleveland. That was 5 years ago and I could have sold the motor then for $4500. I'm glad I kept it, it's going in our '66 coup with the 3" flare kit.