IMO a 2" spacer in front is going to be to much. Front will sit higher then rear. I swapped out for 18/59 and mine sits perfect, I also added 1" spacers on all four corners. I gained 2.5" total. and you will need extended swaybar links and shock extenders as a minimum, although you can drive around safely without until you get them. Next on my list is AEV drop brackets.
Edit: if your putting bigger tires on you may need to address bump stops also. There are lots of threads on this subject, just do a search. GL