The correct configuration management process to overclock your processor is going into the BIOS settings, and increasing the power of the motherboard. This is the safest way as well to overclock.

no

yes, you can

You can overclock it, bit you can't put a new board in. If it's one of the older Macs that used the motorola processors (g4, g5, etc), overclocking will require some soldering and other hardware mods. If it's an intel Mac, there are apps that will allow you to overclock.

Overclock it.