"Camber" is a term that describes the angle of a mounted wheel relative to vertical. Regardless, the H&R springs are a direct replacement and require no other mods or parts to be installed properly. Though if you are having them installed, it's a good idea to replace the shocks, struts, and strut bearings while you have everything apart.
The springs are primarily lowering springs, but they are also stiffer than the oem springs.
Your third question would be best answered via research on your part. Suffice it to say the difference between the first and second gen fx "car wise" is huge.
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