as for the rear, the spring perches can always be cut off and rewelded in right place anyway correct? Here's an example for doing the offset to center the wheels.
http://s67.photobucket.com/albums/h298/1951otter/?action=view&current=Scan1_0001-1.jpg

Like Smitty's said, the drop axle is much easier but will run around $400 + new king pins and other front end parts while you're at it. Just trying to clarify for ya.