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Another good option I've used is to find a local cylinder head rebuilder in your area....they usually have a ton of head cores since that's their business. You might get lucky in a salvage yard in your area too since 318's were so common.
Aerohead racing components. They have stock items for OK price, and are a division of Indy Cylinder Head, so they can get anything. Is it Ok to recommend ICH here lol??