I also agree that tag is definitely a repop.
Yep it sure looks that way, and a shame as it takes away so much from the car. Engine pad pits look funky, rust pits?
I can't comment on the tag but the rust pits I can. My 67 BB convertable was apart when I bought it around '79. The motor had a spun bearing and was yanked out of the car so the block sat on the water pump side with no water pump on the ground for years and sank up to the heads with the pad buried. The owner died of bone cancer several years later after coming back from Viet Nam (likely agent orange) so the car sat for years in his parents back yard rotting until I bought it. The pad was pitted a lot and you can hardly make out the stampings but the numbers are there no less.
I believe the pad is legit. Disclaimer - At least by the pics shown.
I can make out the rear BU code, but not the date?
Based on the pics provided, overspary inside and on the frame rails, it appears that it could have been an original Hugger Orange Camaro.
Wouldn't blacked out rockers be correct for this RS?
That would be correct.