PAL is 50Hz - the majority of LCD monitors advertise syncing down to 56Hz. You might get lucky and your LCD will sync that low, but it's more than likely that it won't. There are a few LCDs that will do 50Hz, often LCD TVs if you're in a PAL region.
Depending on your chipset and Kickstart ROM, you can boot into NTSC through software. There are also hardware mods possible.
NTSC brings problems of its own, given most games were made for PAL, also some games AFAIK will force PAL by themselves. Since it's 60Hz though, it should display fine on LCD monitors.