DOn't but an LA series! They run fine but are seriously weak in power. They can barely get a trainer off the ground and forget moving them on to a sport plane later!
This is coming from somebody who probably hasn't even tried this set up.
When I first got into glow planes, I bought a used .40 la along with the Hobbico Superstar and I ran the engine very rich not knowing and the the engine was powerful enough to fly my trainer inverted without a problem. Not only from opening the engine and seeing the black burnt oil inside I knew it was too rich, but while flying one day a guy just from hearing it said it didn't sound like it was getting as much power as it could.
I junked that one and bought a new one almost a year ago and put it on a P51 low wing trainer and it pulls it almost vertical .
I see you bought the .46 , although .40 doesn't seem much different from a .46 IT IS .... When I bought my OS .46fx and put it on my trainer I was shocked at the difference in flight characteristics.