The Cape Dory Board

I'm considering repowering my 30ft ketch and was looking for any tips on motor selection and fitment. It currently has a Yanmar YSB12 motor with a Walter v-drive. I'm moored in a tidal river and feel the 12....more like 10hp I'm getting is a bit under powered. Any help or suggestions would be very a...

I was wondering if anybody has repowered their CDK30. What are my options for a replacement with reusing my Walter v drive or complete replacement.