Tail shaft markings??? Guess it would help knowing what transmission your car has
Also for things like suspension to help one would have to know
PS?
AC?
Standard or HD suspension?
Body style?
Transmission (as mentioned)?
Since each of these would have an effect on the markings.
While we're at it can we see a picture of where you are as far as suspension finishes and details?
No reason focusing on adding marks if you'll be loosing points on the parts themselves