I'd be surprised if you ran lean with the reccommended jetting in the manual but if you did happen to, I don't think it'd hurt to run the larger fuel jet except that you may need the same jet for the nitrous line in certain combos.

My kit took about an hour and a half to install including the purge valve and the wiring to the remote opener. I have a question for anyone with a remote opener... Do any of you have a hard time getting the teeth on the servo to line up with the teeth on the valve gear? I've been struggling with it, and it's the only part of the kit that is regularily giving me hell. LOL.