I have read the many previous posts on the 68-69 smog systems. My question is the date code of the AIR/smog pump in relation to the remainder of the engine compartment and the car build date. My car has a build date of March 13, 1969 (S/N 718855) while my original engine compartment components are mostly January (15th, 17th, 21st, 24th and 29th) to an engine stamp date of January 30th. Since I need to find an AIR/smog pump for my car, what would the ideal date be for my car? I am not sure where it most commonly falls in relation to the other dated items. Thanks in advance for any response which does not merely say "6 months before March 13th."

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