70s Corvette bodies

I've started looking for a mid 70s to 81 corvette to purchase and I am unsure of the problem areas on a vette to look for when going over a car. I owed a Camaro (77) back in the day, but need some help with the idiosyncrasies of a 30 + year old fiberglass sports car, such as doors, body fasteners and interior pieces. And hows the availability of parts? Thanks