just be aware, I believe that is an externally regulated alternator - typically used on 1960's vehicles, but some models used this style into the early 1970's.
The different rear case is tell tale that it's an internally regulated one.
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1970 Formula 400 Carousel Red on black (std) interior "no drivetrain option" car (same base drivetrain as GTO) 1:411 1970 Firebird Formulas originally sold in Canada