are you talking about timing the inj pump to the motor?
if so.
1. take off the valve cover and distributor cover
2. turn the motor till the timing on the crank is at zero, rotor is pointing at the hash mark for # cyl, and the cam notch is up and aligned with the hash mark on the front tower.
3. then turn the crank timing to 20 degrees AFTER top dead center.
4. with the inj pump in your hand, look at the front where the gear is. this is what you need to time.
5 turn the gear till the notch aligns with the hash mark on the front face of the pump. I think this is about 10 o clock.
6. put the inj pump on the motor and your are done.
I highly recommend you get the mb cd or a haynes manual. these will help you out quite a bit. see one of these for the valve job procedure.