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To sum up if you have a vibration issue similar to mine first area to look is THE DAMPER. 360 engines are external balance and sensitive to being out of balance when damper gets old.

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There are 2 styles of factory 360 dampers - yours, which I call new style, and the old style (which I prefer) that the weight is ADDED to the center hub, not taken out of the outer ring. On the old style, (on the left in the photo from the archives) the weight is added to the outside of the center hub, so the "imbalance" of the outer ring doesn't stress the rubber cushions like the new style. The new style probably work well enough for you, since you probably don't spin the motor much above 5500. Above that, the RPM will start to work and wear the rubber ring, causing the outer ring to rotate or wobble, causing a vibration. I don't know the years that the old style ones came from, but I grab them when I see them.