Not specifically related to a build...
A while back I asked Magnuson about a lower manifold for non-hellcat applications, and they indicated they didn't have one on the shelf, but I wonder if their casting protects for both hellcat and non-hellcat bolt patterns...There is a member here making adapters though.
The E-brock unit looks like it uses shrouded compressor inlet, but no jackshaft. Ive been told the un-obstructed inlet only makes a difference beyond 18k rpm.
I have worked quite a bit with the Magnuson unit in a brand X application, and its quite an impressive piece. It almost has me looking at blowers rather than hair dryers for my next project