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My 97 has some spark knock at light loads and I think the compression is close to 9.3 to 1 stock (cast iron head). If I had to rebuild my engine I think I would look at the combustion chamber areas on the head surface and make sure there were no rough spots that could create a hot spot and encourage preignition. Not really removing a significant amount of material, just making sure the combustion chambers were clean, fairly smooth and maybe even check the volume of the individual chambers to make sure they are very close to the same volume. If not then work a little more on the lower volume chamber.
I would use one of the wizz wheels you use to remove gasket material. Might clean up around the plug threads with the plugs installed, looking for partial threads where they were cut for the plugs and getting rid of them.
Matching up the ports to the manifolds to make sure there were no issues that would affect flow.
Use the old head gasket to make sure you do not remove any material that would effect proper sealing of the head gasket.
regards
Mech
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