First bit of advice is stay away from dealers. 2nd and this is my opinion don't buy something with a fresh paint job unless they have pictures of the restoration and process, a lot of people will do a hack job and quick paint to cover up rust and other issues. As far as engine goes it depends all in what you really want. Are you looking for engine and drivetrain to be done, and just needing interior work? If you want a big block, then look and don't settle. You will eventually find it, just don't rush into something. Lastly a lot of the guys here would be more than happy to give their opinion and maybe go look at a car with you if it is close to the, and you are serious about it. Welcome and good luck in your search