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Hello I will help you with your question,
Yes, you need to put the marks on if you can.
Click here for marks
Let me know what I can do to help
The dot is in the same place as the old arrow?
For the crank chain it is the cam drive and the crank drive, no idler. Yes the cam sprockets need to be on their marks before you install the chain/grear to the cam drive.
This is a 2.0L correct?
The dot is lined up with the key as shown in the diagram I posted above? Did you view the diagram?