All '89 - '92 SC's came with SC embossed in the front bumper cover. If your car does not have it then the bumper cover has been replaced.
As far as the cornering lights, it was an option. I believe it came with the "Illumination Package" which included auto on and auto dimming headlights, auto dimming rear-view mirror and when you lift up on the door handles and the doors are locked the interior lights should come on. Now I'm not positive about this and I'm sure some are going to come back and say that "I" have this option but not another! This isn't the gospel and Ford seems to have incentives on purchasing option packages versus just one particular option.
Just my .02
Dale