Zinc coating for the whole car started with the '76 model (so after September '75), but was applied to ALL cars only in mid '76.
Zinc coating of the floor pan only was sometime earlier ('74?)
The problem is, that you usually cannot trace the real date of production. So be careful with an early '76 model.
However, zinc is no guarantee for no rust!!!
The 2.7 is an issue of course.
Jens
'76 2.7 with '73 body conversion
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