If she's chasing $8500 for it and in it's in almost showroom condition you might want to try somewhere like ebay or australianmusclecarsales.com.au ; it might be worth that much to a collector, but given (rising) fuel prices, the car's age and also the car's limited desirability (sure it's an SS, but it's an auto VP SS) i reckon you might struggle to get that much for it. By comparison, i saw an immaculate black VS SII SS with 220,000 km at a caryard near maylands about 3 months ago, they were asking $4200 for it.
Best of luck with the sale tho mate; hope it ends up in decent hands rather than a P plater who'll destroy it..