The only 427 that it could be from is a SOHC, and I don't think this what it is. All 427s except the SOHC have the pushrods going through the intake, and the valve covers also overlap the intake. I believe it has to be from a 385 series big block. 429, 429 CJ or Boss 429, depending on the port shape.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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