A couple of things I forgot to mention:

1. The white lines I've added to the picture denote the markings already on the fire wall from the factory. As can be seen even without measuring the vertical line is not on center.

2. It looks as if the cowl won't clear the engine if the engine is moved to the left any more, this is not the case and is simply a bad camera angle on my behalf. The engine could be moved at least 3/16 of an inch to the left and the cowl would still clear...

Thanks!