With the right thrust the engine mount position should be offset so that the prop shaft comes out at the center of the cowl. I was more concerned with the spark plug cap clearance. I set it up so that the clearance to the closest plug on one side to the other side was equal. It is approximately ¼” clearance. I needed to offset the engine approximately 1/8” which you can see in the next photo. I used #10-32 blind t-nuts mounted from the rear with a little gorilla glue so they don’t push out too easily.
