Help me buy an $80,000 car

You have $80k to spend, you are FAR better off buying a private sale rather than from a dealer or consignment type place. For a start your $80k is buying you an $80k car, not a $50k car marked up. Also to meet and talk to the owner is invaluable. You get to see where they live, how they act in terms of the car, get a good feel of the history and how the car has been treated. They are also far more likely to tell you the truth about any flaws, not like some bullshitter car salesman.
It's more work and travelling for sure, but the end result will be better.
Go on the B bodies site and put a Wanted to Buy advert, there may be some older members who are interested in selling.