If you're looking at cars in Sydney or Melbourne, hit up one of the guys from SAU NSW or VIC. They will be able to point you in the direction of somewhere reputable that can do mechanical checks etc and may even know of the car in question. Book a return flight on your first trip down and try and see a couple of cars. That way, the pressure to purchase then and there isn't on. Head back down to drive it up after placing a deposit. Mate sold his BNR34 to a guy in Sydney and that's what they did.