In December 1984 Costanzo accepted an offer from that year's Australian Sports Car Champion Bap Romano to co-drive the Romano WE84 Cosworth in the 1984 Sandown 1000 as part of the 1984 World Endurance Championship, the first FIA World Championship event held in Australia.
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At the insistence of his long-time open wheel rival turned touring car racer John Bowe, who to this day rates him as the best Australian driver he raced against, Costanzo was drafted into the Volvo Dealer Team in 1986 for the Castrol 500 at Sandown and the James Hardie 1000 at Bathurst.
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