I'm probably a bit more optimistic than a "6" on the one to ten scale for an oem subframe with the proper bolt-on components.
Take a look here and then we can address more specific questions:
http://www.ridetech.com/store/1967-1...d-level-2.html
Keep in mind that the coilovers are directly interchangeable with the ShockWaves and can save some money if you don't put a lot of importance on ride height adjustability. Here is the coilover page:
http://www.ridetech.com/store/muscle...hash=V330.V264
The biggest development for OEM front subframes lately has been the Tru Turn system:
http://www.ridetech.com/store/tru-turn/
For some video footage of Velocity and the 48 Hour Camaro with all of this stuff:
http://www.ridetech.com/tv/
There is a huge amount of information here. It will likely take you several weeks/months to digest it all and make a decision. Take your time and ask around.
Part of the fun is the planning!