The 120AX will pull it around but it may be a bit weak on reserve power. It's tuned for torque and not much of a revver (I have one). I'm putting an OS 1.60 with the inverted muffler in my BF-109 and I know it will have plenty of power. I have the same set up in my 86" Kawasaki Ki-61 that weighs 20 lb, and it pulls it around very well. Used a gun on it the other day and with a 17X8 prop it hit 111 mph. I'm thinking the 109 will be a bit fast for the 17X8, so I will be using a 17X10 to keep the engine from revving over 10K in flight. A Moki 2.10 may be a bit more than you really need, but you should have reserve power a' plenty!

Photo of the Ki-61