Make sure your pulleys are on tight also.
I had a vibration just like that. A bolt holding the crank pulley on snapped and eventually the other ones loosened.
It got worse, then eventually the other bolts sheared, lost the pulley, the belt, and the water pump pulley was damaged when the crank pulley hit it.
Luckily pulleys are quite easy to find for these cars...
-steve in nj-
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