The Plymouth Weslake DOHC Motor from the 60's

Im on the hunt for that book believe me !!!
All I have covering my Mullen heads is this

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This is the 1974 catalog. One before the 1975 you posted.

I’m pretty sure the Mullen prepped head is a Hemi head. -Mullen didn’t just do small block.

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This is probably Larry Shepherds number in Detroit. I doubt he’s picking that one up anymore ;)

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