I am building a Top Flite Gold Edition Corsair, I am putting the Robart 100 degree retracts and hope to have the weight under 9lbs Do you think the Saito FA-90 R3 would be big enough for this plane? Also if it would be what size 3 balde prop would you recomend?

I was toying with the idea of putting the 170r3 in but my standard cowling is about 3/4 of a inch too small, and not sure about the wieght this would add to the nose of the plane.