Well crap, someone has to be a downer so I guess it is my turn.
First, it is flat out gorgeous. The kind of machine we all wanted at 15 if it was a motorcycle.
The bad news is that engine is your life.
These birds come down fast and hard when the fan quits. Yeah, the stall speed might be only a bit higher than some others, but what is the sink rate just before the stall? You might come over the numbers just above stall and still get your spine crushed by the vertical speed.
Have someone who is really, really good with engines and systems on high performance airplanes go over it with a microscope before it flies and repeat the whole nine yards after the first couple of hours.
The fact that it flew 68 hours, apparently without incident, is good news. And the fact that your dad has intimate knowledge of the bird is excellent. But the systems have set there quietly deteriorating for years. It won't be the big things that bite you, it will be the little insignificant item that just didn't occur to you or your dad. It is the flaking liner on a fuel hose. It is the rusty bearing on a magneto. It is the prop seal that has become brittle and blows the oil out all over the windshield when you are low and slow. And on. And on.
Yeah, I want to see the video of those first flights like everyone on here. Fly smart my friend.