Here's a video from 2001 of Dale Sr driving the Corvette in 2001. Onboard @ 4:50 of the chicane. Dale fluffs passing a slower car there. The entry of the chicane looks to be at the same speed.
https://www.youtube.com/watch?v=Rqj0g4ta6U8
Here's an external view. Skip to 23:00. Exit speed looks as good as the current chicane.
https://www.youtube.com/watch?v=kVJIMM8MGAs
Because the middle straight of the chicane is longer, I'd imagine it's a little slower back in the day. If that additional straight is about 50-100m long, then that's 50-100m where you're travelling at 100mph rather than 180mph. So in my uneducated, uninformed and made up opinion, I think the current layout is faster.
But the flip side is the Mazda has half the horse power and less fuel. Still broke the time.