They won't put an LS7 in a Camaro from GM because it would compete too much with the Vette.
Secondly, the hood is flat black because this is a drag race car concept. Flat black keeps the light from reflecting off the hood into the driver's eyes.
2009 Challenger R/T - Arrington Forged 6.0L and Magnacharger Supercharger - 600RWHP 600RWTQ (PB E.T. in 1/4 Mile 10.85 @127.39MPH)
2016 Hyper Blue 2SS Camaro (PB E.T. in 1/4 Mile 12.093 @114.43MPH bone stock)