As for what else you would need for the 4" lift, you'd need a 4-6" drop pitman, a 4" drop brackets for your front pivot arms as well for your radius arms. Your shocks will need to be replaced.
As for tire fitment. You should be able to get away with 33x12.5's.. with MAYBE a bit of rubbing at full lock.
Here is my 93 with a 2" leveling kit and a 3" body lift (5" lift) with 33x12.5's