It doesn't really help you now, but collector car insurance is usually better for old cars because instead of blue book, they will insure for an agreed value.
Finding the same make, model, and year in TN only with phone number listings will be tough. If you could expand the search to surrounding states, a range of years, and also including fastbacks/notchbacks you might have more luck. Try some local auto trader magazines too, you never know.
That's quite a narrow bunch of requirements they've given, you're almost guaranteed not to turn any up.
Could you put together some receipts for parts/service on the car that would help justify its value?
