Early A 22" radiator saddle

64_Barracuda said

64's came with 22 inch radiators, on in A/C cars..... with the two piece shroud as well...

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Could be that some real late 64's did come with the larger core support and 22 inch radiators, Late in the year changes to the next model year's stuff was not uncommon back then nor was using leftover stuff in next year's models.