Sockets:
Some had socketed oscillators delivered from phase5, some had the oscillators soldered on. If yours is soldered directly to the board, then simply replace it with a socket.
Ram:
Use 60ns modules only!
Speed:
60 MHz definately will work, 66Mhz should also work fine. YMMV, depends on the 060 itself. With a newer mask 1G65V 60MHz 060 from gurumeditation.se or somewhere else, even higher speeds than 66 MHz may be obtained.
SCSI:
Two different versions of the Cyberscsi module exist.
One with a 'Symbios' SCSI chipset, this one does not tolerate any overclocking.
One with a 'FAS216' SCSI chipset, this one will accept overclocking with no problems.
Disclaimer:
Your mileage may vary. I am not responsible for any damage done to your hardware from doing the above mentioned actions.
EDIT:
Cyberstorm mk2 040 boards can easily be upgraded to 68060, instructions can be found on amiga-hardware.com