If you follow eric's directions on mounting the motor it is quite easy. I put the fuse in a verticle position and placed the mount with the engine attached on top, then I place the cowl as if I were installing it over the assembly (very careful not to move the engine) line up the trim lines on the cowl with the ones on the fuse then move the engine shaft with the backplate of the spinner attached so that it all lines up. When you carefully remove the cowl the engine should be properly located.

When I did it, I was withing a 16th. of Erics measurements