hmmm..
Never installed 1.3 to the HDD before, but I'll see what I can do.
You first need to create partitions on the HDD, using 'HDToolBox'
Then after a reboot, you will see an Icon for you new partition(s), all you should need to do then is select the icon, and select 'Initiallise' from one of the menu's, and after a few "Are you sure?" questions it will format.
This is the part I might have trouble with:
In theory you should be able to drag the icons accross from the disks to the HDD, or at least under 2.04 and higher you can, since there are files on those disks that are hidden to you, and can only be revealed with either 2.0 and higher or using the CLI.
See if there is an installer script on one of your disks, if not you may have to resort to the Shell.
:-)