A good buy, perhaps if one is willing to work on it themselves. But a great buy, regardless, I don't think so.
That T5 Polara 500, which has been for sale since last November, looks as if it has had work done to the lower rear quarters. It seems to my eyes that the work was not done right (wrong curvature of the panels) -- which means there has been rust (so a thorough look is needed) and the current repairs need redone anyways. Now, one knows how much money can go into a restoration.
The advantage of the car for sale here (DM27H9D241455) is that all work has been done, which puts an upper bound on costs (though one is never done with old cars...). Here is a YT video of the car when it was previously for sale:
