340 Engine Shake

You're right. I'm getting overwhelmed with my mind going to different possibilities. Here are the pics of the plugs. I took these a few days ago.

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Spark plugs are hard to read due to lack of driving time, but that's OK we can work with what we got here.
I dont like what I see.
Plugs look cold, werid color variations
No 3 looks dead lean and may not be firing
Timing mark is to faint to read, needs some road time.