Well - as a point of reference my 3090lb 485bhp C5 Z06 could not really hang with a Cobra at MSR Houston road course...
Of course it was 98% driver (him being 98% better than me

), but he was able to chase me down and pulled me soundly on the drive out of corners.
As far as I know the car was a Superformance 427ci Ford car.
The Cobra is light and that helps a lot.
I would love to see a head to head Cobra vs C6 Z on a road coarse. I will try capture some telemetry next time a C6 Z and Cobra show up.
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MTI/LMR Katech CamZilla LS7 Z07, Kooks, Intake, Stock Ti SAE 568rwhp & 512ft-lb N/A @ LMR, Houston