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'70-'71 manifolds usually don't get above $300 on ebay / $250 at shows.

the parts catalog may have the part numbers not the casting numbers

LH - part #2951864 / casting #2951865
RH - part #2899968 / casting #2899879

I'd "assume" the date on your RH manifold is 12/1/69 & both to be original to your car!! (1 week after the LH)

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just check another casting number source,casting
#2899879 equates to BCE 383 2bbl and 440 LP.#2899970 is listed as 383/440 HP.