Yep just those bolts, the inj are sealed with special o-rings top & bottom.
If plugs wet it either means inj is dribbling or plug not firing.
You could test coil & plug as unit, just remove plug,reconnect coil, earth threaded section of plug & crank over engine & observe if theres a spark.
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I used to be indecisive but now Im not so sure!!!
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