Just from the putside it'll need front fenders. (Does it come with the passenger side one?) Is there rot on the front of the rear driver's quarter? How are the floors and trunk? What might initially look like a good deal could cost a ton in body work.
Also, what body parts are missing? The $ for the missing parts adds up fast.
Unless you do a lot of the work yourself, $5k might be too much.
Is that a 318, 340 or 360? WIld guess it's a 340 if it's the original engine. What shape is it in? Numbers match? Check the VIN to see what the car ws originally. It may not matter to you.