If your Fuel Injection Pump has the Port for it for about $37 you can get the Fuel Injection Pump Timing Locking Pin.

With that properly in Place you just need to turn your Engine in the Direction of rotation till it is coming up on the Compression stroke. When you reach top Dead Center on the Compression Stroke turn it past tha and stop at 15 detrees after OT (after top dead center).

At that point with the Fuel Injection Pump Timing Locking Pin installed you just stick the Pump in so that the Studs are as close to being centered tin the Kidney slots on the Front Pump Flangs as you can and tighten up the Fuel Injection Pump, remove the Timing Locking Pin and replace the Plug.
If you want there is another plug at the top of the Governor Housing where you can dump in some Engine Oil; about 1 pint.
And, you should be all timed.

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84 300D, 82 Volvo 244Gl Diesel