Yup, there shouldn't be any gaps around the the throttle plate when closed. That's why Honda uses that black sealant stuff to make sure the plate gets a good seal.

I'm not sure what kind of timing you're talking about, so I'll assume it's ignition timing. Even if you didn't touch the distributer, chances are, your ig timing may still be slightly off, so it's not a bad idea to re-set it.