You can't just throw out a question without knowing the sensitivity of the particular plane to engine weight and CG effect. If you choose a heavier engine than the plane was designed for, flying qualities will be altered. So I'd analyze the engine weight the designer intended and then be in better logical shape to make comparisons. If most of the engines you listed are too heavy, the question may be already decided. I fly with a 912 and weighed it on a scale complete with everything required to fly, from mufflers to oil tank to radiators at 146 lbs total. It makes 100 hp at 4gph mogas.