I know for a fact the o2 sensor wire will need to be lengthened, I think when i did the swap on the civic I lengthened the Oil Pressure sending unit wires as well.
I don't know what i was thinking you shouldn't have to modify any plugs, Since it's OBD0 to OBD0 you should be fine. If a plug doesn't reach your going to have to lengthen it (you know how to do this right?)