Rust and front end issues are probably the main ones to look out for in these models. There are some reports that the first generation V8’s caused damage to the chassis and frame of the car, so check this too.
Rust in bottom of doors, under front and rear windscreen, in floor pan and in sills
Front suspension issues
Steering issues
Fading/ clouding tail light lenses
Leaks into cabin/ boot
Power options on the higher spec Premier models