You rang?
If it's NA, and road usable, I'd go with no more than 268/268s - Schricks preferably.
For track work, maybe Schrick 276/276s. Only 0.1mm more lift, and a bit more duration...possibly makes for a few more BHP at the very top, at the expense of low down torque.
Personally, I'd opt for 268s, a Schrick VSR manifold and a re-worked corrado 2.9 TB as that combo is epic!
For FI applications you want to limit the duration or you'll blow the charge straight through.
276/276s are out for turbo applications...probably 268/268s too.
They do a set of 264/260s which would probably work - good lift, with only slightly more duration than standard.
Or stick standard cams if turbo-ing.
For supercharging, I'd suggest either standard or 264/260s.
The 268/268s may work...but you don't need the duration with a blower, and the 264/260s have the same lift as the 268/268s but less duration to blow the charge through.
So, my choice would be 264/260...on a Schrick VSR if you can find one. torque tastic!