Given those parameters, the theorethical top speed would be about 174.5mph. That is Z06 territory and a mid-12 sec Buick would have about the same power, but aerodynamics and a broken steering wheel would peg the Buick at about 150mph would be my guess also. At 150mph, not only would I not want to be behind the wheel, I would not want to be in the vicinity.
The broken steering wheel? That would be from gripping it so hard
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Scottie's GNZ