The 312 T3 entered service at the third race of the 1978 season for Villeneuve and Reutemann. The flat-12 engine producing around 515 bhp was the same one used since 1970, but the monocoque, suspension, and bodywork were new and tailored to the Michelin tires. Against the ground-breaking ground-effect Lotus 79, it stood no chance. Reutemann won four races, Villeneuve claimed his maiden victory at the season finale in Canada, and Ferrari finished second in the Constructors' Championship.
Summarized from the sources cited below; every figure in the text was automatically verified against the sources.

1975
1976
1979
1980