Moffat senior, who won the Great Race four times, raced the Monza in the IMSA Series in 1975.
He used the car in his successful 1976 Australian Sports Sedan Championship campaign.
Brown also owns the Holden Racing Team Commodore that Garth Tander and Nick Percat raced to victory in the 2011 Bathurst 1000.
Fittingly, the Tander/Percat car was the last Walkinshaw car to win the Bathurst 1000 until Mostert and Holdsworth won on Sunday.
McLaren Formula One team boss Brown has recently honoured a number of bets for his drivers.
Notably, Australian F1 ace Daniel Ricciardo got to drive Brown's ex-Dale Earnhardt Chevrolet Monte Carlo NASCAR as a reward for his win in the Italian Grand Prix.
Ricciardo turned laps in the Earnhardt raced at the Circuit of the Americas during the US Grand Prix weekend.