'Lotta' Work!
The engine is offset a few degrees for the right hand prop. The offset would be to the other side for a left hand prop. I Know, I had a Mazda Rotary on my RV-8. It had a left hand prop. I had to mix up some epoxy filler to fill the wide gap behind the prop spinner on the right side.
When I removed the Mazda, and installed a Lycoming, I had to cut, grind & sand out the filler so the prop & spinner would fit VAN's original cowl offset.
You would also need a special motor mount to provide the left offset, yet position the prop in the center of the cowl.
Otherwise, you would develop a very large muscle in your left leg!