The Ferrari 400 was built from 1976-85, it replaced the 365 GT4.
To visually differentiate the 400 from the 365 GT4, the 400 came with a chin spoiler, paired circular stoplights and the deletion of the emblem from the radiator grille. The interior got more sumptuous, with better seat upholstery, different stitching, patterns and slightly changed switchgear.
From 1976-79 it was the 400
From 1979-85 was the 400i, now with fuel injection
And from 1985-89, the 412, now with more style and more power