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I can't give you a first hand experience but the recommended plug is an Autolite 3924. I would think that would be too hot for a 10.5 engine. The same heat range plug is recommended for the eddy RPM head and I found it too hot at 10.2:1, I went one heat range colder in an NGK - BCP6ES-11. For yours I would start with a NGK BCP7ES-11 and see how it looks after a good run. It is always best to go colder first, obviously you need the tune right also. The plug Andy recommended has a heat range the same as the plug I use but it has an extended electrode - this may well be the way to go.