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When an manufacturer that is making an end use product like an automobile, motorcycle, airplane, locomotive, etc. assigns their part number to a vendor of sub-components it is likely that the part so assigned represents a somewhat unique to that specific part by the end product integrator.

Therefore it is possible that some characteristic of the Chrysler part numbered Holley metering block is not compatible with other Holley carburetors even though it bolts on.

Even within Holley you can get into trouble mixing parts a good a example is square bore and spread bore metering blocks will bolt up but not all passages are in the same place.

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