With a bit more digging around I've found the roads they used for the original circuit. Time has taken its toll and the circuit as it was is no longer usable, a highway now cuts through it twice and the railway viaduct and both wooden bridges are gone. The road they called the Flying Mile is the part of Illawarra Road that isn't the B52 highway.
Here is the Longford area: http://maps.google.com.au/maps?client=f ... 20tasmania
and here is the track map: http://wikimapia.org/15100111/Longford-Circuit
As you can see, the Flying Mile is dead straight but it is only a mile long with NO run off at the end, just a tight turn onto the highway. I'm presuming they intend to use the original road and I don't know that it would be suitable for many of our specialised salt vehicles. Bikes with front brakes would be fine but two wheel braked cars with a parachute wouldn't get through scrutineering as it is a CAMS event. It is only a week before the Targa Tasmania so I presume that's where they expect the majority of entries to come from.
Maybe they should use a little historical licence and use the Cressy Road instead. Anyone still interested?