I am going to disagree, the G-38 is going to make a descent aerobatic airplane into a flying brick. My opinion is go with the ZDZ-40, Brillelli 36, or Brillelli 46. All of these engines will make this air frame fly much better.

If all you are worried about is saving a few dollars buy the G-38, if you want a good flying airplane, then go with one of the other engines.