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.