i would recommend getting the oversized king pins and having new bushings pressed in and reamed to the correct size. putting all the load of a loose fitting king pin on the locking pin (especially on a daily driver) is not a good idea. aside from handling problems it could also cause excessive wear on the bushings and eventually on the castings.
it does require special tools but i found a shop to press and ream the bushings when i replaced my king pins. it was pretty inexpensive and well worth the effort.
