I used an OS 91 Surpass in mine. Lay the engine on it's side. I had no problem with the throttle hookup the best I can remember.

I would think a Saito 150 would be way too much for this plane. It's not an aerobat or 3D'er. I'm not sure you would even have ground clearance for the prop with a 150. IMHO a 120 is pushin the envelope a bit with this model.

With the 91 it will fly great. I flew mine so much I got tired of it and sold it to make some room for something else. I kinda wish I had it back.