Date codes vs build dates.

[Larry]

My 1968 Z28 has a 12E build date. Is an August 10, 1967 alternator too early for my car? This has probably been discussed here before, but I couldn't find anything by searching.
Thanks,
Larry

[LT12NV]

Typically it's 30-90 days...So you are right at the "cut off"..But i'd say its decent chance of being origianal.....Does it have the deep grove pulley with GM part #?