RE: how to set new engine
Yep... most trainers 2 to 3 deg right and about 3 or 4 deg down. Larger engines (compared to the size listed in the instructons) need more down.
Note the downthrust angle is relative to the aircraft "neutral flight" Not relative to the bottom of the main wing. The angle relative the the wing can be LARGE... 9 deg relative to the wing is not unreasonable.