Our 1977 Seville leaks water when just sitting in the driveway. Help

Does it have a sunroof? If so, perhaps the drain tubes have been clogged up with gunk and need to be carefully blown out with compressed air. I would suspect also worn out weatherstripping on the doors. There is a company you can call, in PA it is called Rain Doctors, which will come out and find the problem and fix it for you. It could be a lot of things, hard to say for sure without seeing it.