I would imagine any plant that assembled full size Ford's installed 427's. They were an RPO (Regular Production Option). I've seen R codes from Louisville (3U), Norfolk (3/4N), LA (3J), Wayne (3W), Chicago (3G), Atlanta (4A), Dallas (4D), and Twin Cities (3P).
What other plants may of assembled full size Ford's, Pilot Plant (S)?
Regards,
Dennis
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