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it might not be what you want to hear but i would still recommend a camber kit for that much of a drop. any time you lower a car with springs it's always a good idea fixing the camber, so yes, get a camber kit.
Also know, do you need camber kit when lowering car?
When you lower the car, the camber will go out and you need a camber kit to fix it. However, I find it is not necessary to correct the camber in most cases. Most people think they need a camber kit because of a tire-wear concern. The reality is, TOE ANGLE kills tires WAY faster than camber ever will.
People also ask, do I need camber plates with lowering springs?
If you purchased a set of lowering springs it's extremely important to get a set of aftermarket caster and camber plates. After lowering your Mustang, you will need a front end alignment, and this is where your new caster and camber plates will come in handy.
I'm not sure how much it cost for camber kit though. spring install should be around $100. for camber, it should be less than $50 for sure.