Hi David,
Your tunnel port intake looks very similar to the photos I have seen of the intake used on Shelby's Can-Am car.
I am building my own intake pretty much the way that your intake was built. I cut the plenum area out of a single plane 2X4 intake and I'm making a pattern to cast 4 flanges angled at 8 degrees to mount TWM/Weber 58mm throttle bodies. If the flanges come out well I'll cast some extras and offer them to anyone else crazy enough to try to build their own EFI tunnel port
The work is going slower than I'd hoped because of all the other Cobra work I'm doing at this time but as it progresses I'll post photos
--Mike