Can I replace the 68060/50 with a 68060/75 on Phase5 Blizzard 1260?

[Damion]

Yes, you'll need to solder a crystal, and of course the processor. Best would be to solder sockets for both. If you're handy with soldering equipment, the crystal socket is pretty easy, the processor wouldn't be terribly difficult either, with a little patience.

IIRC the 75 MHz '060s are all FPU-less, so just replacing your 50 MHz crystal with one rated at 66 MHz (and adding cooling to the existing CPU) would be a good upgrade.

[Damion]

Redrumloa probably has one, if you don't mind ordering overseas.

You might also want to get a 60 and 65 Mhz crystal as well, in the rare case your proc crashes at 66 MHz.