Bronco Project

Name is Chris, first post here. Got an'87 full sized bronco i bought 13 years ago. Put 8 grand into rebuilding all the mechanical on it. It has sat for last 6 years or so. Still runs great just have not used it. Decided to turn it into an off road toy, my boy will love it!!It has a 2.5 inch rough country lift already. I just bought new 33's for it and wanted to get a little more lift but I am a broke fireman so not a lot of money to spend. I bought add a leafs for the rear already because my plan was to throw add a leafs on the rear and 2" coil spacers up front on top of the lift it has already to give me 4" total. I was told this will NOT work because i would need to buy some extra bracket or my aligment will never be right. Is this true? If so anything else i can do? Like i said money is short  and i cant really afford a whole new 4" kit but not really sure 2.5 inches of lift is enough for the trails me and the boy want to do. Thanks!!