I have raced a 99 Z28 auto convertible on the freeway in my cobra. I had my top down, he had his top up, 3 people in his car, 2 people in mine. I pulled a length by 120.
I also raced a LT1 camaro, not sure of year, no badges but it was an LT1 with exhaust. I pulled 3-4 lengths from 70 to 110...