@ikir
Great! a Super 060.
Is it also easy to upgrade (overclock 66Mhz) a Blizzard 1260?
Yes. Simply removing the oscillator and replacing it with a faster unit will work. Beware though. The B1260 can be finnicky WRT speed. I've known some people running 'em at 66Mhz reliably and others who can't take their's past 60Mhz.
The model revision of the SCSI addon module seems to be the limiting factor.