I hung mine by the landing gear so the nose was pointed straight up. Then I put the engine where I thought it should be. Put the cowl on and got the engine lined up in the cowl (make sure the cowl is centered and positioned properly before centering the engine in the cowl). Then carefuly removed the cowl (without moving the engine) and mark the holes. Its also a good way to get your cowl holes marked to get it lined up as well. I did both at the same time, cowl first then engine.