I would put the body lift on first, depending on how you are lifting the body off the frame, if you are using a hydraulic jack to do it the lower the frame is to the ground the less you have to raise the jack.
I just did a 2" body lift with a 2 ton floor jack and needed 2 pieces of 4x4 and a 2x4 stacked to get enough lift and almost used the full lift of the jack