The drip method is an approved FSM procedure .....and quick and cheap to do....
You could just get a junkyard line and cut it as a drip tube.....

What is interesting is how far off the timing can be on these engines with no real performance differences noticed....

I was real dissapointed when I set mine from 13* BTDC to the correct 24* and did not notice any real driving change....that is how tolerant these engines are....

Still good for peace of mind to know that your timing is FSM correct....

Then you can get on to other maintenance issues of which there should be several....I have a 1978 300D also......still lots of things to do on mine......this is the fun part of these things....

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)