I must tell you guys this. I permanantly mounted about 6 ounces of lead in the nose using Epoxy thinking that this would be the only engine for that plane. I added an additional 3 ounces using screws so they will come out easy. The epoxy'ied ones will NOT come out. Period. So, I have to watch the weight up there. So, lighter is better, I can add weight easy enough. But heavier, by 3 ounces or more is not.
I will second the TT .91. OS quality at a Magnum price, but a bit heavy. If you have 6 ounces of lead in the nose then you could put in a 1.2 four stroke, if you have enough prop clearance.