If the chains have marked links, it's probably to help you during chain installation. I.e. so you don't have to count the links between the sprockets. Timing belts have marks that line up with marks on the sprockets, so you don't have to count teeth. Maybe these chains do too?
I'm surprised no one on here who actually takes these motors apart has chimed in yet. But, like others who have replied, I believe the IMS sprockets are not timed.
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