Being a track car wouldn't put me off. Most people that go to the effort of tracking a car generally take muh more care of the car. My car has oil changes almost monthly during the summer. The engine has never skipped a beat, never been ran on cheap fuel. Evidence of Pads, discs and tyres don't prove anything except theyve been changed. What I'd be looking at now is, tyres on it now, quality of pads and discs that are on it, structural/ chassis damage, signs for radiators being changes etc indicates that it could have been involved in a frontal collision (wouldn't let his put me off unless they deny it or the chassis has damage.) Evidence of regular servicing(ie ask them) oil that's been used for servicing and how often. And most of all.. Drive it and see how it feels.
Looks very clean to have been a track car IMO. Looks more like a showcar (that looks like a track car). Obvious things like lots of small windscreen chips etc would indicate its been on track, roadrash all over wings bonnet and bumper.