First do you want a finished car or a project . If you go finished ask for pics of build to see what has been done . When you see a little plastic cover over cowl vent its a leaker.

If your looking for a project car try to find one where someone has lost interest but the car has been in inside storage not beside the garage . Be cautious of some cars that are in primer if the pics are at the right angle you can see there is just a cover up.

Project cars watch for upper cowl rust this is a very large job to replace them . Floor board rust is real common in the front on stangs allways ask for pics of undercarraige if your looking on line . They rust in frame rail where bumper brackets mount . Trunk floor drop offs are another area .

So many where stored outside on mother earth and most the bottom sheet metal has returned to her .

I'm getting ready to get rid of a 67 Cpe it will be offered on ebay in primer but i have pics of build . This will enforce a restore and not a dump of a car needing lots of metal work .