Most of that late model Camaro is throw-away plastic crap that's not nearly as good as the 68 pickup stuff. Switches, pedals and the steering column were engineered for that truck, are stout, and made for easy servicability and durability...why change? And I don't see the need to completely re-engineer the underside of the truck to install lighter-duty car suspension and brakes from a unibody car. Truck arm suspension from the sixties is the coolest of ladder bar style suspensions that is copied for many circle-track classes, and rides WAYYY better than leafs!.
It will be enough of a project to install the late-model gastank under the bed and piece together the fuel system and wiring harness.
Things I'd re-use: engine and trans, wiring harness (mostly) and computer, seats, sounds, wheels and rear end (maybe).
I'd sell everything else of value and buy dropped spindles, springs and stabilizer bars. Several places sell dropped spindle/disc brake packages for less than a grand that come with rotors either 5 lug or six.
It's upta you how you are gonna do it, but I'd suggest that you only replace what will physically fit from the Camaro, or be completely necessary. Use the best that each vehicle has to offer