Rust along top of windscreen is another one, check for any damp in footwells and under boot carpets. How handy are you mechanically? If you've ever changed a car clutch in the past the timing chains aren't such a big job to do at home with assistance from the forum, but hellish expensive on the labour if done in a garage. And at that point, it would have to be an Indy specialist that knows the VR engine not the local Kevin Webster.