First off, thank you to the poster of the Sooner girl. Outstanding! Reminds me of an old girlfriend of mine....
Now to the car. I simply cannot and will not believe the mileage to be anywhere near accurate with just 65K on it. Even if it was owned by oil rigger, the wear to the interior is beyond 65K plain and simple.
Next, as a person who buys and sells these cars quite often, you can count on spending at least twice to three times your original estimated number. That's a guarantee! I recently purchased a '91 GT, well as recent as March 25th of last year anyway. This car your interested in made mine look like a brand new 928. I spent the next 8 months and $10,000 bringing that car up to nearly showroom, but even if I skimped on acheiving that, I would have easily spent $8,000. This GT your looking at, I would estimate will end up costing you anywhere between $10-$15K just to make it acceptable. And the anguish and aggervation involved during the whole process will simply exhaust you. When it comes to the world of 928's, your best bet is to buy the least work involved 928 you can afford out of the shoot. They're already expensive cars to maintain, and one's that start out rough, will end up breaking you.
To me, this is a car that I would pass on at any price. Your best bet is to buy a well documented, no stories, well sorted 928 in as close to perfect condition as you can find. If it costs you $18,000, then you'll be saving money vs. buying this $6500 GT, I can promise you that.
Best of luck with your final decision, but I strongly advise you to immediately pass on this project of all projects. But if you do end up buying it anyway, then my words will echo in your head for the next two years!
Todd