Whats the engine and whats the plane. The same problem occured on my 4*. The way to do this is to put the engine in a 10 oclock position so its slanted upward. This will allow the muffler to stick out and the engine remain inside the cowl. If then the engine mount goes above your cowl area you can use a dave browns engine mount (curved sides) and it should fit. Im not 100% sure of the aerodynamic problem having an engine pushed more to the right, but its probably better to stay away from that.

Papa