I remember reading a pretty good rant about the value of stuff like this. In it, the guy was pointing out how aggravated he gets everytime he sees a highly priced car that was an original whatever, but needed new body panels, the engine isn't original (or even there), and on and on. His point was, it may have started out as something very desirable, but if the parts that made it so are not there, and large portions of the car need to be rebuilt anyway, it should not be sold for exorbitant sums of money just because of what it USED to be.
Now, obviously, if it's a wing car or a Shelby Mustang or something like that, you're still gonna pay more just because those creatures are in a different class altogether as far as price goes. But I am seeing complete, beautiful, driving big block cars that can't sell, and I am seeing hemi cars going for under 50k, if they sell at all, and then factor in just how much that Bee is going to cost to resurrect, and it isn't the original block (are the trans and rear original?) Your best bet is to figure out what the parts themselves are all worth. Base it off of that. And I mean, realistically worth. I know several people sitting on B body Dana 60's that want several thousand for them, but I don't know anyone that is actually willing to pay more than a grand, tops, so those rears will continue to sit.
I've noticed, WAY more so than any other makes, a lot of Mopar guys have this tendency to keep prices on everything absurdly high, and thusly, keep pricing themselves right out of everything.
A perfect example are the seats that Bee needs (and the seat tracks). Go ahead and ask around for the seats and tracks, and look at the prices you get back. And then realize, "they're just frickin seats and some metal brackets, for gods sake". Half the guys looking to sell them have been staring at them on the garage shelf for 10 years. There isn't an army of dudes hunting the things down. Hell, there's only a finite amount of cars out there that even need them, but plenty of guys selling the seats and tracks. It isn't like the street rod guys are gobbling them all up to use in their fiberglass "Fords".
I'm not sure what your prior experience is with restorations and body work, but if you're new to it, I would stay away from anything that need a lot of metal work, good floors or not. There are some guys on here that I see performing miracles with cars that look like they were salvaged from the bottom of the ocean, but for most people, that is an art that they will never master. Once you have to have a body shop do your car for you, you're immediately upside down on it. Do you absolutely have to have a real Bee? If so, ask yourself why. Is it for the investment? If so, stop right now and run far away from muscle cars. If it is for bragging points, well, then, I hope you don't mind spending a LOT of money for bragging points. If it is because of the options (paint, interior, drive train, etc...), just do what I did. Keep saving your money, and keep searching far and wide, until you find one that someone ELSE is WAYYYY upside down on, and has to sell it now for peanuts, and buy that. It may just be a regular coronet, but you're already ahead of the game if the body and paint or even interior are done. It may even have a big block already. At this point, tailor it to your tastes. 4-5k can get you a 68-70 B body with all the body work done and a fresh paint job, minus the drivetrain. I know this because that's exactly what I did back in April. Around 10-15k can get you a finished driver clone that was done a few years back. Unless it's got a wing and a beak on it, I will NEVER pay 15k for something I can't start up and take for a drive!