Mario Party 8 doesn't need any particular setting.
It should work fine with default setting (IOS249, no alt dol, no ocarina, no video patch). I'm using WBFS partition, with cIOSrev17.
for CoD, I never played it, I don't know if it need something special. you can check the Alt dol Method (see bellow) to see if it's a known reloading game.
The wiki doesn't say anything for this game, it should work fine.
There's only few games needing a special setting :
Musical games (guitar hero series, all games needed microphone) : Hermes 222/223 [37+38]v4
Monster Hunter Tri, animal crossing (needs USB for Wiispeak) : Hermes 222/223 [37+38]v4
Arc Rise Fantasia : cIOS[56]rev20, or wiiflow with cIOSrev17
New super Mario Bros : need a patched dol (done by the loader since r822)
Prince of Persia : need a patched dol (done by the loader since r935)
Then, there's a lot of games which you need to boot using Alternative dol method, to prevent dol reloading.
SSX blur, Red steel 1, Metroid duo/trilogy, etc.
For these one, before starting the game, go to the individual game preferences, booting method, alternative dol : select from disc + select known dol (if the loader find one, then the game is known as a reloading game and it needs the alt dol method).
And 2 games which need "alt dol+" method :
Sam & Max 1 & 2 : doesn't work on GX, but works with neogamma (and maybe other loader with "alt dol+" method)
