Depends on the look you're going for. I used to have a 1500 - put a 2" front kit on it, and a 1" spacer in the rear, and it sat level. After a few weeks I decided I preferred the raked look, so I took out the 1" spacer and replaced it with a 2". This brought the rear back to about 1" higher. Here's how it looked:
Sorry, I don't think I have any pics of it when I had the 2/1 combo. If you bring the front up 3", a 2" spacer would level it. But I would tread carefully and consult some of the more experienced forum members before you go so high. Generally, anything above 2.5" can potentially damage CVs and UBJs.