If you're still pretty stock with minor boltons I'd stick with the LS7. Pretty nice clutch for what you pay. I ran the same setup in my fbody making 430/405 and it held up nicely in a 3200lb car. So with that I decided to put one in my LSx FFR..
In regards to the flywheel the typical difference is aluminum for road racing, steel for drag racing. For these cars since they're so light I imagine you can get away with using an aluminum one..
Tails