My gut feeling is the TT GP-42 is a good match. A 46 Pro or Fx would be overkill. And in another thread about a Tower Uproar, someone suggests the TT GP-36 as being a very good engine because of power and weight considerations.

Is it true a lot of guys are using the TT GP-36 in this kind of airplane?

Being a profile and not too big of a plane, I'm thinking this might be a sweet combination. Any thoughts?