You will need different (Superbike compatible) handlebars, a 1 mm shim for the lower triple clamp, a Superbike front fender, and either a shim for the front axle pinch area and a different axle nut, or a Superbike axle, in which case you have to change the bearings and speedo drive in your front wheel. If your friend's 916 forks have 40 mm brake caliper bolt spacing your calipers will be fine, if they are 65 mm (I can't remember if any 916s came with 65 mm spacing), then you would need new brake calipers and brake hoses. It's a lot of stuff (I know because I did it to my 1997 SP).
I have Cycle Cat clip ons on my converted front end and I love them. They are adjustable (though not by much because of fairing placement), wider (easier to throw into turns), and the best part, they look trick!