Install as per manufacturers instructions.

No, a camshaft in itself, as long as it isnt fucked, will not cause misfires.

Incorrect installation or tuning could cause misfires, as can a myriad of other external things.

If you had installed it incorrectly and 6deg out would that cause misfires ? Unlikely but it would affect performance. Obviously as the dizzy is driven off the camshaft this could then be affected by this...but then that comes back to correct installation and tuning in general. Right is right, wrong is wrong.