just googled it and found this
Hi Nick, First of all it wasn't a GTHO but was called a HO. Take one new Falcon 5 litre, add EB GT like wheels, a body kit, add a Yankee built Vortec screw type supercharger, tip in some Recaro seating and Momo steering, add the name of a famous Falcon race car campaigner and whammo, the Allan Moffat Signature Supercharged HO Falcon.
This wasn't a Factory Built car but was done with the approval of Ford Australia and Tickford Engineering by Bob McWilliam and Wayne Draper, the former has been running Phase Autos for Donkeys ages. Its a company that turns out fibreglass body kits for Fords. Wayne was one of the original designers on Falcon GT's back in the 1970's and had been with Ford on and off up to 1988. In 1992 the two got together and got serious and a company called Homologated Options( the name of the Allan Moffat Car) was born out of Phase Autos. Today Homologated Options do most of the body kits, fitting and painting for Tickford. Now to the car........
It starts with an boot wing similar to the EBGT and finishes with a number of subtle, yet highly effective fibreglass panels. Sitting fore and aft are HO's own design 17*8.5" alloy rims which are clad in Dunlop Formula W-1 tyres, 235 45*17" on the front and 255 40*17" on the rear. The HO revised suspension consists of revised spring, shocker and roll bar rates. Stopping power is improved with comp style DS11 pads which are fed with cooling air from spoiler mounted ducts. The interior is limited to a Momo steering wheel and Allan Moffat Signature, but there is a option list which includes Recaro or Paratus seating.
It doesnt matter what you opt for the 5.0 litre V8 or the in-line 4.0 six, HO simply bolts on a US developed V-belt driven Vortech Gearcharger,(Engine-driven centrifugal supercharger).
The six gives nothing away to the V8 in a straight line, but the V8's torque is greater out of corners. V8 top speed, about 240km/h (150+ mph). Claimed power on the V8, about 235kw, no figures on the 6.
So Nick, basically this car was based on a Ghia but if you want one you could start at a GLi right through to a Fairmont Ghia. The only way to get the Allan Moffat Signature though is to opt for the entire kit; wheels. tyres, supercharger and variuos badges. The one you have heard about was probably based on a EB XR8 Sprint, with the (at the time) $16,000 Allan Moffat Kit. The price at the time for the Allan Moffat HO was around 60 grand, but in comparison the EBGT was around 70 grand with the EBGT only pumping out 200Kw.
Hopes this helps you, any more questions or any other mysterious cars to investigate please let me know as I have alot of free time at the moment recovering from a spinal fusion operation that has laid me off work for about 3 months.