Ed,
I got my Funstar in trade from one of my buddies that crashed my plane. That being said, I didn't install the engine but the way it's in there looks factory, It is inbetween inverted and laying on it's right side. About a 45 degree downward angle I guess. The head sricks out the right side of the cowling. It is made like this because it has a recess in the center of the fuselage behind the cowling for the muffler to go. I'm running an 8 Oz. tank in there now and there was a Hays 4 Oz. tank in it when I got it. I have had no problems with the engine running. I run a Pro .46 Thunder Tiger and it rips that plane around great! Hope this answers you question.