Ford didnt really give any adjustment for camber on the Mustangs with the stock setup. As the car lowers due to the A Arm design the top of the tire tucks in. Since your car will be 2 inches lower always (or how ever much the drop gives) then the tires will always be tucked inward more due to the suspension geometry.
Once you go much more than an inch (every car is different) it becomes out of specification. Since you cant adjust the stock camber (in/out angle) you have to use aftermarket caster/camber plates to allow you to put it back to stock specifications.
You could technically install the springs and see if it can be aligned but I doubt it will be. If it cant be you will have to pay to have the CC plates installed or do the work yourself which is just about like doing springs in a few ways.
Might as well get it all done at once, should save on labor. The CC plates are under 200 bucks and are a high quality unit and look great as well.
They allow for GREAT camber/caster adjustment. The top plate can be fliped side to side on the maximum motorsports units to allow more negative camber for cars that are dropped more or those that simply want more negative camber.
With the H&R race I think you should consider CC plates. Also when you lower the car the strut is pushed into the strut body more all the time (car is lower all the time now) the CC plates from MM let the strut come up a bit more to take some of that back out so this helps as well a bit~
Thats mainly what they are for and not for handling performance, just for the ability to align the car easier/better. Without them you will eat away the inside of your tires much quicker.
I have MM 4 bolt CC plates (only ones they sell that I know of) and I love them, they require a new hold to be drilled but its not bad.
get with the sponsor on the forum they can get you a good deal on a set I am sure. link http://www.mustangevolution.com/foru...-2/#post804548
upon installation keep in mind the TQ specs MM provides and ALL the steps given. Also, the top plate is flipable for more/less camber so keep this in mind as well. I am sure it talks about it in the installation info.