can i do a clean install of os3.9 on the attched scsi hard disk ?
I'm sure you can but if you have OS3.9 on the IDE hard drive, why not just copy it across onto the Ultra Wide SCSI hard drive (well that's what I did when I got my CSPPC :-D).
I have a os3.9 bootable floppy with cd drivers but does it contain the relevent libraries to use the '060?
I've only made an Emergency-Disk from an A4000 with 060 myself. My disk does indeed have '68060.library' in the Libs drawer. I'm not sure if it would be put on a disk created in an Amiga with an 030 or 040, but you could easily just have a look with Dopus or by opening up the disk and looking in the Libs drawer yourself :-)