Can anyone help me with the best way(s) to make this work???
2010 Arctic cat 366 with 29.5s??? Thanks

 

put 26's on it and adapt to having less clearance than the bigger bikes, or else put 29's on it and only ride it in a parade.

You will spend far more $$$ making a 366 perform worth a damn with 29's, than you will by just buying a 700+cc and putting the 29's on it

 

a 366 is not going to turn 29" very easily,at least in mud. As stated already you will put more money into it to get enough power to turn them than its worth and it still wont be enough most likely. You may find your self riding in low more often also. Ive got 28s on my 700 and i noticed a slight power loss but got clutch work done to help with the power loss since i want low and mid power for my style of riding.