I'm pretty sure it could be done with a lot of exhaust fabrication work (custom headers, downpipes, etc.) one trick to putting them in a fox-body (MM & FF had an article on one such car, and I've seen another in person) is turning shorty headers upside down so that they exit at the top and towards the front, then mounting the turbos there, then running the exhaust down and below the headers., something similar could probably be done in a II (though I'm not 100% sure since I've never tried it)
Another possible approach could be to do them like those kits for the 4th-gen F-bodies that places the turbo underneath the car with a pipe that returns to the front for the air, I seriously considered a twin-turbo setup along those same lines in my old Chevy pickup until I decided to just run a bigger engine and bigger carburetor for simplicity's sake. I still hope to build a twin-turbocharged street car (who knows, maybe even my II) someday, but I've got other dreams and realities that need to be fulfilled first.
__________________ 1976 Ford Mustang II Ghia: 302 with a 600cfm Edelbrock carb, Edelbrock Performer 289 intake, Dynomax Blackjack headers, 2.5" exhaust with Flowmaster Super 44s. RJS 11-gallon fuel cell, C4 tranny, chrome 16" pony wheels, fuzzy dice, brown vinyl half-top, and painted in the tackiest color ever (harvest gold, that's why I call it "The Goldenrod").
Also have a 2003 Dodge Ram (lightly modded daily driver/tow rig/office/dining room/home away from home/workshop... I call it "The Big Blue Dawg".) | 
Anybody ever put twin turbos on a 1976 Cobra Mustang? 
