I was looking this over earlier . Ok the fork is a Marzocchi DJ 80 mm 477.5 DJ 100mm: 490mm Fox F120: 490.9mm So with this you get hardly no change in geometry but gain more travel hope this helps.
i was talking to a guy from dmr on facebook a couple of days ago cuz i had tha same problem, he told me the max you want to put is 100mm but 80 is ideal