$15k rebuild? Try a $10k repower instead.
Or...use PB Blaster, which much more effective at loosening struck hardware in my experience than WD40. Be cautious of overspray and what the PB Blaster comes in contact with. Also, have you tried removing the plug after the engine has been recently run so that the block is warm? Cold blocks/plugs are more difficult to remove than warm plugs.
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