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 not an OS AX .46.
The reason for this is power! The OS LA series of engines are light in weight , 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.