Update: Engine is "ticking" under acceleration and at highway speeds. Not very loud, (if radio is on at low volume can't hear it). There is also a "rattle" while idling that is fairly loud. So my decision to change the chain without checking the timing was a bad one. Still running very good.
I've searched with a stethoscope all over the engine but I'm having a hard time finding the tick because it doesn't make the sound at idle. #6 injector is a little louder than the others so I switched it with #5 and slightly louder sound seemed to stay with #6 cylinder (listening on injectors). I can't distinguish the rattle to any certain point either.
I would like to read and follow the manual to check/adjust the timing. I have a link to the star tek manual but can't find this procedure on there. I have a dial indicator, but I will need a way to mount/secure it. I also will need a drip tube??
Can someone give me guidance and a link to the proper procedure/manual? I've read threads till I'm blue in the face. Thanks.

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1991 350SDL 350k+ miles