New to SCSI, but other existing HDDs on RAID mobo?

[EvilHorace]

Tomorrow if all goes well, I'm planning to add my new SCSI adaptor (Tekram DC-390U3W) and SCSI Seagate Cheetah X15 HDD to my Abit KT7-RAID mobo and to be safe, I'll unplug the 2 existing IDE HDDs so that I won't risk losing anything from either while getting the SCSI HDD up and running.
Now, once the new HDD is partitioned with all its drivers and Win98SE installed (assuming that everything goes well), can I then just re-plug the 2 existing IDE HDDs back into the RAID plug (the now primary HDD running Win98SE) and have 3 HDDs all running together without problems or will it likely BSOD being that my existing IDE primary HDD now has Win98SE on it?
I've run multiple HDDs before but not 2 with operating systems on each and I don't know if that'll cause serious conflicts or not. I've never done the "dual boot" thing nor know anything about it.
The 2 IDE HDDs are also only going to be there temporarily until I copy any needed files, etc onto the SCSI drive, then they're both going to another PC.
Any hints or tips will be appreciated.

[Rooster]

Two things I can think of are:
In the Bios change "other boot device" to SCSI.
Copy the drivers to your boot disk.

[MK888]

Also make sure your bios boot order is "Floppy,Other Device(SCSI), C:" this will insure that it sees the SCSI before the IDE, and boot from the SCSI drive.