FCP will drop and duplicate frames to convert a 24fps to 29.97fps sequence.
Are you running at 24fps or 23.98fps BTW?
To convert, FCP will add 3:2 pulldown to a 23.98fps sequence over firewire to playout to a DV deck.
If that's not suitable, check out my Standards Conversion plugin at www.nattress.com which will add 3:2 pulldown as a render to any 24p or 23.98fps movie.
Graeme
[
www.nattress.com] - Plugins for FCP-X