You have slackened the 4 bolts holding the inlet cam sprocket to the variator, and the nut in the middle of the exhaust cam sprocket havent you?
This will allow the sprockets to move in relation to the cams. You can the line the mark up at the bottom (On the auxillary belt pulley), tension the belt then tighten them back up.
You will need to fit the lower part of the cam cover to do this.
Then turn it over twice by hand with the cam locks off, line up the bottom mark again and make sure the blocks will fit back on.
If so thats the job done.
Fiat Coupe 20VT, mildly tuned to 260bhp
Never take laxatives and sleeping tablets at the same time.