I think a better option than the Z28 model would be to put the Corvette ZR1 engine in the Camaro and call it a ZL1.
This seems like a more worthy advisary to the Mustang GT500KR.
"With the factory's stock dual exhausts and tires, it turned low 13s; headers, slicks, and tuning got it into the 11.6s at 122 mph. Chevy never built a quicker production car."
If you don't know what the ZL1 is read this:
http://musclecars.howstuffworks.com/...camaro-zl1.htm