1969 Z/28 date code

[sam]

I have an (11D) of 68 Z/28. The radiator is the CB code with the ( L) date and my bumper jack is stamped (8L) the car also has no proportinate valve for the brakes under the seat. Has original brake line still. Can I assume these to be all correct for my car? Thanks,  Sam

[KurtS]

As I said last year , you never know what's been done to a car over the years, but those dates look OK.