Thanks for the input. We have been working out way back from the prop. We hit something with the prop and replaced it. Still a vibration so looked at the strut and realized that needed straightening. Sent it off for straightening and put it back on. There was still a vibration when we put in the water so we ran the engine with water running through it and looked at the end of the shaft. We could see a visible "wobble" in the shaft. So now we are working to fix that.
I have someone mechanically inclined and good with engines helping me, but working on boat maintenance is new to both of us. Any and all advice is helpful.