You know that you want to try the rally setup with that motor.
I know I would at least once.

For a clutch I suggest finding one with a small diameter flywheel or you might need to shim the motor up even more. The smallest one that I have found is the XTM sliding clutch and flywheel setup http://www.hobbypeople.net/gallery/149596.asp real smooth and positive engagement but the clutch shoes does not live very long. In something like that I don't think any clutch shoe is going to live all that long unless they are aluminum but then you will wear out clutch bells.

rolland