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The springs will not allow it to sit on the mark, you have to set the rest of the pullys then string the belt and put the back cam in position and install the belt to hold it in position.
The alternative is to get a cam holder that installs between the pulleys to hold them in position. It may take two people to get this done. One to run the belt and one to hold the center bolt with a wrench.
Let me know how I can help
Sorry, I meant two people - one to hold the cam with a wrench on the center bolt and one to string the belt to hold it in place