Yes. Trying to use any other transfer case is going to create all kinds of headaches. Unless you plan to swap axles too you should stick with the factory case.
FWIW you can run your driveshafts at an angle. It's more complicated to set up though and will bind easier under flex. Not really...
Are you not using the factory transfer case? It offsets the drivelines to the correct alignment assuming you keep it relative position between the frame rails the same.