Check for rust as they tend to rust from the inside out, check the front end as a number of issues existed there. Also check the chassis and frame, early V8 days for Holden and it may have lead to extra strain or damage.
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