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This 73 R7 was classified as a prototype so it had to race against the big boys versus the class they would normally. For a little more background the description is 

The Ex-works team, Ex-Herbert Müller/Gijs van Lennep 4th place at Le Mans, Ex-Peter Gregg/Hurley Haywood, Ex-Hector Rebaque 1973 3-litre Martini Racing Works Team Porsche Carrera RSR 'R7' Endurance Racing Coupé

Then we dicuss is this a turning point for the 963 GTP team getting a podium and leading for a majority of the race.