I too have a 4*60 that was VERY tail heavy. I placed the engine on the mounts so that I left room behind for the fuel tank lines, and in front of the fuse front for the prop to clear. I think the instructions have the distance indicated. I used and OS91 Surpass for the engine, put the battery in the nose just in front of the bulkhead behind the fuel tank, moved the radio as far forward in the servo well as possible. I still had to add 2 oz's in engine well, a 2 oz spinner weight, and a packet of large washers in between the fuel tank and the battery. Yes the plane is heavy, but it is fun to fly, and I have other aircraft that I can have just as much fun with and are more manueverable. It really boiled down to the addition of Super Mario as my pilot. That added a lot of weight since it started its life as a Bobble Head doll. You probably won't have the same problem.