GLsawyer
I used a CX racing H1C on my 6.9idi for a while before I destroyed the seals due to being an idiot and using tiny oil feed restrictor made for a ball bearing turbo. I ended up rebuilding my stock turbo and somehow I'm still leaking from the oil drain! (Time for a hammer and a sharpened screw driver)...
I only made near 2.5-3lbs in 4th at 2800-3k rpms. Other than my screw up, I think you could make a CX racing H1C 18cm^2 work with more fuel. It sounded sooooooo good! Use a flexible Cummins oil drain into the stock location, bolt the turbo to factory up-pipe, have a 2.5"OD V band to V band 90 degree pipe made and bolt it to a Banks downpipe.
Try it, I'd love to see another CX, Holset, or S360 budget build!