Approaching owner

[YENKO DEUCE REGISTRY]

That might be your first impulse. However, if the person turned out to be a normal enthusiast that just wanted to check out a car, what's the harm? I have never had a case where a person wasn't somewhat flattered that somebody (especially a younger somebody) was into cars this much to actually search out an owner. The owners are usually very accomodating when it comes to answering questions about the car's history, their personal experiences with the car, other cars they happen to know about, etc... If you treat the person with the respect they deserve, you won't have a problem.