408 tuning with a Wideband sensor

These should confuse you to death.... :)

http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Board=QuestionAnswer&Number=7402006

http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=7705794&an=0&page=1#Post7705794

The second has some good info for when the main jet starts to show up. Log A/F by MPH/RPM and you'll see them start to activate.