How to buy a 68 Cuda.

I was at a car show this Saturday, and there was a 68 Cuda Notch sitting there with a for sale sign on it and no owner. Its a 318 car, buckets consul, nothing fancy. Body looks tough like it has been mudded over in several places. Glass and rear bumper are nice, the grills are nice. Front bumper has a smack in it. Looks like a complete original car to me that is to say that all the body panel line up pretty well, so i assume they are original to the car.

What if anything do i need to ask this guy about the car, and what should i look for personally? My Duster was an easy purchase, it was a 20,000 mile car with no rust and was a virgin in complete original parts the way it came from the factory. This Cuda makes me nervous!!. What would be a fair offer to this guy as well? I know its hard to make assumptions without pics etc, sorry i forgot my camera at home. Just looking for a place to start before i call him.