Bellof had won the 1984 World Endurance Championship driving for the Rothmans-Porsche team, but decided against driving for the factory in 1985 to concentrate on Formula One.
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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.