One possible way is to use intall it using LILO on a boot disk. I would suggest creating the installation disks (bare.i, etc. or whatever you would need) and go as you normally would. Once you get to the part where it asks you where you want to put LILO, select the option that uses a floppy. Using this method it wouldn't touch anything on the other 2 drives. It would also keep anyone from accidentally booting linux without that boot disk (nice way to keep from confusing the casual user).
Hope that helps. Let me know if you have troubles.
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