importing AE comps into Final Cut....confusion

Wondering how i should output my comp from AE, if i want to import it into final cut (version 5).
my sequence settings for final cut are based on footage shot on a DVX-100 (23.98 fps) with an anamorphic lens adapter (so i guess it's squeezed while shooting, then final cut unsqueezes it when you bring it in).......when i'm in AE, im not sure how to deal with the whole square pixel deal or if i export it as an animation or whatever......kinda confused on the whole process.
also, maybe kinda a bozo question, but i was wondering if it's any better to export the final cut footage and import that into AE, and work from there?

Thanks!

-dean