Teh $8500 price isn't terribly high for a project car, being a 300 and a convertible.
Not gonna find much cheaper than that, unless they are a complete POS.
It's wearing $500 of new tires, and the interior looks pretty serviceable (but needs new seatbacks from ABC).
It looks pretty solid, but needs $10k in paintwork and new top (and I'm guessing on the low end).
So it's $18,500 and no runnability/reliability work has been done.
And that the tough rub on cars like this.
They are for guys that have hte money to buy and earn the money to restore as you go.
If you have the money, buy a restored car from someone for less than they invested...