A518 46RH rebuild

That graphic does not tell the whole story about the mount position. The 46RH and 46RE have a different pattern. You have the old style 727 904 mount. Have you tried to attach it to your 46RH trans yet?

In your original post you showed the trans upside down. In that picture you can see two bolt holes next to each other and then one more hole several inches back. That is the three bolt pattern these transmissions use for their mount brackets.
My later truck used a completely different trans mount setup for the 727, and it appears to be what they did to allow either a 727 to fit or a 46R series.

I will go out and find the 727 mount again and add the picture, just for reference. I thought I took pictures of the 92 D250 while taking it apart but I don't see them.