You sure Porsche was not champion in 1971? That was the year of the 917 and 908.3 
The next year was the Speed Merchants year and the Ferrari 312PB (flat 12) won everything.
I think the side of the ALFA said 1975. It was a later model than 1972.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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