Hi Carl,
I was just about to reply to your email when I saw you had posted on here. I have not got a book on the Turbo 330, but the standard 330 diesel with the DPA pump was timed on the flywheel mark which is 24 deg BTDC. If it is the same as the turbo, then on the DPA pump ,there is a cover plate near mounting flange and if you look in there, there should be a mark on the rotor, with the letter B, this mark should align with the square end of the adjacent circlip.
After reading you post again, you say it mentions 12 degs to mark T, I am now wondering if this is a "turbo" timing mark and the D is for normal aspirated Diesel. Best get a second opinion here. It is a long way back since I was working on these and little details like this can escape the memory.
regards, Richard