The OP's question was what plant the Hemi block came from.
All Hemi blocks came from the Trenton (Michigan) Engine Plant.
All Hemi engines were assembled and tested in Marysville, Michigan. I believe the official title was the Chrysler Industial and Marine Plant.
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1968 Plymouth Road Runner, Hemi and much more
1968 Dodge Charger, 318 and not much else
1958 Dodge Pick Up, 383 and loud
1966 Dodge Van, Slant 6 and cool
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