Hi!
As you are a newb the most perfect engine for you and your friend , in a high winged trainer would be an OS LA .40 or .46
engine...and not, I repeat no an OS AX .46.
The reason for this is power! The OS LA series of engines are easy to run and easy to set and very durable and they deliver what the OS AX .46 does not ....power that is smooth and gentile, not explosive.