I have the same problem with the milodon pump cover interferring with the motor mount on my aluminum hemi world block. About a 1/2-inch off. Already had the pump cover machined down on the rear by Tim Banning at FHO Hemi's in Ontario when he built me the motor for me. Thought that would take care of the problem but guess not!
I don't know if the cover can be machined any further without hurting it. I can replace the rear plug with a flush plug which would help but not take care of it oompletely. Was also told i could use a factory hemi pump cover to take care of the problem but don't know if that would do it or not. I can't complete installing my motor until i get this figures out. BAH!!!!
I'm trying to research this as best i can so I can find a soluton too.
I've tried to attach PICS but they must be too big.
Scott