I am for "less is more" when I look at your list. If you are not leaking oil, then leave the valve cover and oilpan gaskets alone, for example. But definitely do the timing belt. It is supposed to be changed every 90,000 miles on our civics. Assume it was not and change it as a precaution because if the old one breaks your "interference" engine will destroy itself in an instant.
Hoping that helps...
james
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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