The 11.75 upgrade is a good upgrade on a heavy B body car. Lightweight calipers work good for drag racing or autocrossing, not so hot for track use or road racing. Brakes are like clothes, put on what is appropriate for the situation.

The Viper calipers with 11.75 rotors is a good combination if you can find the calipers at a decent price. That is probably getting harder to do these days.