David, I don't know if you received my email about the 289FIA, but my state Department of Transport stated clearly that the car must have an almost infinite number of "modern" concessions, such as :
Fuel injection (with 2002 or newer factory computer)
All related emissions hardware (charcoal canister, catalytic convertors)
No chrome bezels on interior gauges
Seat belt warning light
Padded dashboard top
Side intrusion bars
No working sidepipes
No FIA rollbar brace
Aust Design Rules approved seatbelts
ADR app'd tyres
Engineers drawings required for pin-drive wheels
6 digit odometer mounted within 15 degrees of line of sight
Collapsible steering column
Steering lock
Beaming and torsional testing required
Emergency lane-change testing required
Exhaust noise below a pre-determined (LOW) decibel reading
Side mounted indicators
3 wiper arms (most likely - to cover a certain % of windscreen)
Well, that's all I can think of right now.....
On the other hand, if Kirkham bodies were somehow mounted onto a repaired 1960s chassis, then a rebodied / repaired 1960s car would fit the current requirement for "Historic Registration". This would enable the car to come into the country and be driven in Queensland as a left hand drive, sidepipe equipped, IDA webered, rumbling monster that you'd expect an alloy Cobra to be. So David, you wouldn't have an "old" chassis lying around your workshop, would you?