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If the head is off, you can look into raising the compression ratio by milling it. I remember asking a shop a long time ago about doing that to a 1ZZ and they said you can take a decent amount off (but like all engines, you would mess up the timing chain geometry a bit so realistically not much can be taken out). I highly doubt you'll find anything in cams.
2ZZ water pump with slightly bigger pulley will save a little bit of power but you probably won't get your money back for a long long time.
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