2 wheel alignment is all you can get with a solid rear axle. Alot of people will say you do need CC plates and some will say you don't need plates. The only way to know for sure is to install the springs and get an alignment done. The alignment shop will let you know if they can't get the alignment within Ford spec. I wanted to spend as little money as possible just like you but I ended up getting CC plates later on.
Another option is to lengthen the slots in your strut towers to allow for more adjustment with the stock strut plates. However, an alignment shop will charge you an arm and a leg to do this so its only a good option if you can do it yourself.
Just remember, the main point here is that a set of tires cost more than CC plates. Also CC plates are not something to go cheap on. In my opinion, the only option is Maximum Motorsport CC plates.