I don't recall Steve ever having a MkIV Cortina. His first OSCA car was the ex Bob Slade Capri V8 to which Steve fitted a Chev replacing the Ford V8, then this MKIII Cortina which was raced for a short time until contributing parts for his self built Mitsubishi Celeste-Buick V6 (later Chev V8), which was in turn replaced by the ex Clyde Collins owned and Avon Hyde driven Commodore-Chev.
From memory, this particular Cortina Mk III was owned and raced by in turn Clyde Collins (Boss Ford V8), and then Bruce Bellis followed by Tony Newton with a 5 litre Morand Chev V8, then Steve Vigurs with a 5.7 litre Chev V8.