Hi!
If You had the original block , maybe You could find out if it was a SS.
Look for the ENGINE ASSEMBLY DATE/SUFFIX CODE .
http://www.chevymania.com/partsid/suffix.cfm?block=Big
I don´t know about -68 Camaro , but I was told the -69 SS had a minimum 300hp/350ci engine.
Also discbrakes in the front on SS.
Maybe same with the -68?
I also noticed that there is a hole drilled (see pic) on upper control arms on some Camaros (-69s).They were SS.
Maybe it has something to do with ,if there were discbrakes mounted from the beginning?
I bought My car with a crate engine,so it is not possible to look for the suffix code.
But the brake hose bracket is mounted on the frame.(see pic). Willwood brakes on the car when I bought it,so i don´t know if there were discbrakes from the factory.
So i think mine is a "standard".
Good Luck!
"Osdmike"