Yep, sorry Steve, but it can't be a '68 Fastback. The '68s and '69s still had a twin-leading-shoe drum front brake. I'm pretty sure Norton's first year with the Lockheed disc brakes was 1970.
Oh, and the '68 and '69 Fastbacks also didn't have the "reverse-cone" mufflers like this one has, either. Those had more flat-sided and kinda "oblong"(in cross-section) mufflers on 'em.
