Engine or chassis? 6 pt. roll bar & frame connectors for the car. If you use slicks think about a rear girdle in the future. Engine, a really, REALLY good ignition, decent forged pistons, did I say a good ignition system? A seperate fuel system for the nitrous too.
Don't you have that backwards? Superchargers like low compression. Nitrous is fine on high compression. Why ?because, oxygen to air ratio is a LOT higher in the nitrous. You don't have to pack in as much stuff to get the same amount of oxygen.
Actually nitrous likes it all. The only problem is the more compression you have the more likely you'll have a detonation problem. My 466 is 13.5 to 1 with a 350 plate, no prob. As for the superchargers, same thing although you don't want a 15 to 1 blower engine. I have seen an 8-71 on a 13 to 1 engine, kinda wild! Just watch the fuel pressure & keep an eye on the plugs from time to time. If you want some pointers you can e-mail me!