The last time I saw the cars (about 8 years ago) they were very well maintained. Since no one has ever really sat in them, the seats ar probably like new. Now, does foam rubber age? The rubber products were all maintained, batteries never kept in the cars, etc. Of course, blocks do rust with coolant sitting in them. I dunno anymore. Surely they have kept them up, knowing what they are worth.
If you ever are in New Orleans (Metairie, a suburb - on Veterans highway) try bringing some fresh calzones to the old man, maybe he will take a liking to you. Or, if you know someone in the Cosa Nostra maybe you could call in a favor.
Long shot.
Bill