in the 14's depending on driver. If he has built up the bottom end of the car and shaved weight he could be running high 12's mabe even very high 11's. If he has gutted his car, beware that may greatly increase his times. Shaved weight on those cars makes a dramatic effect. If you are serious about doing this, I would shave as much weight as possible on your Z (take out everything inside except for your seat, should be about 140lbs of weight loss = 14 hp or so. Calculate 10hp for 100 lbs saved is a safe bet). Shave as much weight as possible if you can, this will greatly help your chances.
