[Perfectlap]

One owner? pretty cool. I would send in an oil sample to Blackstone Labs to see if the car was well looked after (it's not just about the oil changes). That it has a magnetic drain plug tells me someone was looking after the car to some degree. You might want to update the coolant cap if that wasn't already done. Don't flush the coolant without a new one, air will get in and split the tank.

99's make for good project cars if the engine is solid and you've got some spare cash.
Some low weight mods (exhaust, headers, wheels, battery, etc.) and you can get the car down to ~2,600 lbs. and make for a quick car.