ORIGINAL: trooper-rat
in order to use the aforementioned engine, the centerline of engine will place the prop shaft at 1/4'' above the thrustline of the plans in order to mount the engine within the cowling and aligning the propshaft cut out.
The prop shaft of the engine decides where the engine is mounted.
If the prop shaft is 1/4" too high, mount the engine 1/4" lower.
Whatever............ 1/4" higher or lower won't cause any aero problems. Might not show anything at all.