I jacked up the back end of the car as well. If you don't have a lift it will give you some room when you are trying to angle them in. I am assuming you have more than one set of jack stands. It helped me get the clearance I needed.
If you don't want to save some money and buy from 340plot call Mancini. They are great to deal with on the phone, deal strictly in mopars, know what there talking about and fast delivery. Just my 2 cents.