Re: Wheel stud size
Big 'ol BB stationwagons used 7/16" studs back in the day,..should be ok for your Camaro. Make sure they're long enough,..you'd like to see a couple of threads outside the nut.
Are the wheels hub-centric? Wheels that aren't concern me. Hard cornering that relies on the studs alone is not a pleasing thought to me.