What two marks? The only thing that you need to worry about are that the dimples in the cam gears line up with the embossed vertical lines on the back cover. The cam knock pin on the intake should face somewhat up and somewhat down and offset right for the exhaust. The cam lobes should face away from each other.
I'm not trying to have a go at you either so please don't take this as a serve, I just want to help.
10thou off the head with a .8mm HG won't be an interference motor so don't worry, especially with low comp pistons.
The dizzy is a total prick to get in, once you do it a few times it gets easier, but make sure it's set right. Take the cam cover off if it helps.
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