For that price it better not have any rust whatsoever!! Look behind the real wheels at the bottom edges of the body. Remove the spare tire and look under there. Look underneath the hinges for the hood. Ask the guy has the timing chain ever been replaced. If he is a mechanic ask him to perform a compression test while you are watching and see how close the numbers are from cyl to cyl. For this amount of money this auto should be in excellent condition.

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Jim