There are 2 types of head gaskets for the 300. The early type is composite and the late is a steel shim type. The steel gasket can be used on both early and late and is a supercession to the composite. **The composite cannot be used on the late type**
The late head has the additional coolant gallery in the headface that is allowed for in the steel gasket but not the composite as early heads did not have this drilling.
Make sure you use the late type gasket no matter what engine spec you have.




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.......got to swap the firewall out now

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