Do I need new bolts to install these, or do the factory fasteners work?

The factory fasteners will work with these plates. You're reusing the same mounting points — just sandwiching the plate between the control arm and the frame. Check that your bolts are in good condition before installation.

How much camber adjustment range do these plates give me?

Adjustment range depends on how much the slotted holes allow you to move the control arm inward or outward. Test-fit and measure before committing to a final setting — every suspension setup is slightly different based on your other modifications.

Will I need an alignment after installing these?

Yes. Once you've installed the plates and set your camber to where you want it, get a full front-end alignment to dial in toe and caster. Camber plates alone change one angle — the alignment shop will balance all three.