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Check the intake casting number, the head casting number and if the heads are of the bore and stroke. A true Cobra Jet block will have a C cast in the back the block where the bell housing bolts up. The heads and intake were unique to the 428CJ. These are a few ways you can tell. You can also check the build dates on the parts as well because they did not start pitting them in production cars till about March of 1968. Good luck. Keith
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Keith C
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