would this help?
also, found this:
"ENGINE TIMING
This is the #1 problem on newly rebuilt Z motors: the engine cranks, with backfires out the carbs/airbox, but won't start. This because you have the distributor oil pump shaft 180 degrees off. I did this myself on my first rebuild, it's very common. There's some confusion on the proper method, this is the secret to getting it right:
-Set the engine to 0 TDC on the front pulley.
-Open the oil cap and look at the front 2 cam lobes, they should be pointing up. If they are down you need to rotate the engine once more to 0 TDC.
-Now at 0 TDC, with the front two cam lobes pointing up, the distributor rotor should be pointing at 9'ish o'clock. If the rotor is at 3 o'clock then you put the oil spindle in 180 degrees off.
-In other words: At 0TDC with the cam lobes up....the rotor tip will always be at about 9-10 o'clock if the spindle is in properly.
"
credit goes to Mr.G from the ZClub.net and Bryan Little from DatsunZGarage.com