Vertically mounted engines induce the same torque moment on an aircraft just as a horizontally mounted engine does. The difference being that with a vertically mounted engine the balance weight would be added near the centerline of the fuselage opposite the direction of orientation or installation of the engine. In most cases pilots neglect the imbalance in a vertically mounted installation because it doesn't effect the roll axis trim in level flight. However I suppose that this imbalance in the vertical installation could have effects in knife edge flight as well as other aspects that are less known to the majority of pilots (including myself). This is fresh in my mind because I read a post here where Quique Somenzini had refered to this condition. So my advice would be, if you are as skilled as Quique (not saying you aren't) then I would be worried about vertically balancing an engine. But for the other 95% of us I doubt we could tell the difference.

Happy flying,
Spencer