I measured today:
7 1/2" total from bottom of LIM to highest top point of the plastic UIM.
About 2.5" of it is the LIM.
The height of the M90 is 5.5". The M112 is 5.47".
So design a blower manifold of about 1.75" height, shorten the mount and we end up with a total height less than the stock 3.0L. Sure it is alot more complex than it sounds, issues such as fuel injector/rail placement become an issue, but just continued thinking would work it out.
As for your power steering pump. You can't use the pump off of our engines (Mazda 3.0)? Uses a small remote resevoir that can be mounted anywhere.