Appears to be an original casting, not reproduction. It is dated August 20 or 29th, 1966 with no repairs(which are impossible to achieve the same contours as factory casting) or cracks in the common areas between the ports or anywhere else. Water passages and thermostat mount is in very good shape not corroded. There is some grinding marks under the rear carb on the driver's side where the casting had some porosity that you can see in the middle of the grinding. It is not a weld repair.

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