My Feb '68 SJ fastback is a non-GT S-code car. Manual drum brakes only, but does have power steering. The original motor was gone when I got the car back in the 80's, so I can't confirm if it had the chrome dress-up pieces.
Have owned and seen my fair share of 67 S codes Mustangs and unlike 1969 the chrome valve covers and air cleaner lid was used on all of the 67's