I was being imprecise in my original statement of 76-79 for the california exhaust manifold. It was 1/1976 to 1/1979. I believe
@Living in the Past is pointing out that in 1/1979 there was a new component added to both federal and california models (the catalytic converter). At that point the odd california exhaust manifold was dropped and the exhaust manifold for california and federal became the same (at least til 7/1980...not sure how... or if they diverged again beyond that time).
The intake manifolds for federal beyond 1980+ seem to be stamped with different serials and have slightly different port setups but mostly look the same to me. I'm using an 81 intake and exhaust manifold on my 1979.
Tail-light covers....are you just talking about these? I'm not telling you when these were introduced
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