I would use your work coordinate system G54-G59. What kind of control are you using? How do you use the position of the tombstome. Is there a bushing or do you just true up a part? If your faces have the same location each time you rotate to that face for example set G54 coordinates to face 1, G55 to face 2 ect. Then program off of the X0Y0.
A bit more information about your parts, were there located, and how you currently run them would help.