415-C Engine Mount Offset/Angle

Here is a link to the drawing for the engine mount.

www.ercoupe.info/uploads/Main/drawings/a-654.jpg

It shows the thrustline angled 3.5 degrees to the right of fuselage CL, and 5 degrees down from the fuselage centerline. Lots of other good Ercoupe drawings at this site, also.

Perhaps an odd question but I'm trying to find the above values. I've read the engine is mounted slightly off-center but no definitive amount. I've also read the engine is mounted on the centerline but slightly angled to the right. I've also read (and seen in pics) a significant downward prop angle, but also seen pics that show basically no downward angle (i.e. Smithsonian). 

I'm not an owner (yet) nor have I flown one. In the meantime I'm trying to build an accurate flight model in X-Plane.

Thanks in advance.