Welcome aboard!! The 4-108 might be a bit heavy and develops about 30-36hp at the RPMs it is most happy with. I don't think its too over powering for your use. A little on the high side. It will definitely be a great engine if cared for properly. Lots of threads on 4-108/4-107s here so you can learn as much as you ever want to know about the engine.
Hope you enjoy the forum.