Well first you would need to figure out if the springs you have offer any lift or if they are just replacement springs. If they don't offer any lift then you need to get a kit with springs that offer lift. The link I posted above is a good kit and is a total of 4" between springs and body lift.
If you want to use the OME springs you'll want to look up their specific part numbers to figure out exactly what you have and match them up with compatible rear springs... In most cases the OME springs offer about 2.5" lift, combined with a 1.25 BL you are at 3.75" of lift and are able to reuse the stock control arms and fit 33s.