First car , buying help??

hey guys. im searching for a car under 7000, more specifically a mustang gt, 95-97. ive found some that are prices close to kbb value, (some less, some more). ive run carfax reports on them , the mileage is exact or close (some have like 20 or more , no more than 100 miles than said on carfax) as described in the ads. all the cars ive searched qualify for the carfax buyback guarantee. once i go look at the cars, what should i look out for?