I'm building my first ARF- a 4*60 and am at the point where I mount the engine. How do I determine the exact location of the engine in terms of front to back? I know the propeller and spinner have to clear the front of the fuselage, but is there a way to be more exact? Won't this location really affect the final balancing of the plane? The needle adjustment on my Thunder Tiger .61 does not come out from the carburetor at a 90 degree angle, so the precut notch in the fuselage doesn't line up. I guess I just cut a new notch or hole?

Thanks.