 In 1964 Firth and Hoinville won the Ampol Round Australia Trial in a Cortina GT.Firth also won the 1964 Lowood 4 Hour with John Raeburn in a Ford Cortina GT.Firth and John Reaburn finished 3rd in the 1964 Armstrong 500 in a Cortina GT, while Bob Jane won his 4th in a row, teaming with George Reynolds, also in a GT.