Thanks for the replies, it is definitely running better now, although there still is some, probably more acceptable, vibration. I think changing the bolts on the engine mount helped.
Groundforce, I am interested to learn, what did you mean by the bushings being sloppy? If the prop is horizontal, and I grab both ends and lift it vertically, are you saying there might be some play that shouldn't be there? thanks for the clarification. I don't know much about engines, but am trying to learn.
Thanks again!