Thanks guys for the suggestions and links! My biggest reason for wanting to stick with the 7R case is cost. A 3.0L turbo aluminum case is out of my budget unfortunately, and the 3.0L SC case won't work with my current engine components.
I love CIS for its symplicity. It is mechanical, easy to adjust, and reliable, and the 934 made 485 hp with a variation of it. I would really like to continue using it, even if I need to move on to a larger fuel head. I don't expect the driveabilty of EFI with the radical cams and CIS, but that is something I can live with.
I am using aircraft flex tubing on the intake side of the turbo to get it to the turbo inlet, and some aluminum tubing with silicone adapters on the compressor side. This was kind of a proof of concept I put together 2 years ago when I had the engine out to fix oil leaks & replace the clutch. It is a little crude, but it all fits behind the bumper. I was worried about the tubing length from the air metering plate to the throttle body, but the throttle response is still excellent. The car is very driveable, getting full boost at 3500rpm.
