If you are looking for more power, the 60 twin really isn't the ticket. It puts out about as much power as a .40 2 stroke. A buddy of mine has one mounted on his 40 size cub and swings a 12x6 prop - the performance of the plane is not at all over the top, rather its a bit sluggish- even for a cub. The look and sound of it, though, is awesome IMO.
Granted, it will probably outdo your 52 but the weight gain will take away from that.