it actually sounds like a good tuning challenge to me. you might be surprised what you can achieve on 93 octane if you don't just approach the problem as just dropping 5 degrees of timing. there is a delicate balance between AFR and timing advance that you can play with to get a lot of power back, and spark is really complex, some running areas might not need much help at all. you might have a lot of fun with it.
you're confusing deck clearance with quench, that's all. lots of people mix those up because even a lot of machinists seem to use the wrong terms and it gets passed around.I can't see how a thicker head gasket would change the quench area... volume yes but area?
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