A 30-160 would definitely go to the z06 by at least 7-10 cars. The gearing on the 350, and its aero don't allow it to accelerate hard much after 4th gear. 5th is a big drop, to 1.0 from like 1.4, and 6th is .63 which is like going from 4th to 6th in an 03 cobra. Big drop.
Watch hennesseys 175 run. It's literally crawling after about 150. An m4 would be accelerating harder.
The top speed for a gt350 is 175. A 2000 cobra r was doing 175 with 385hp 15 years ago. Z06's hit 202 in private hands according to YouTube. It's not a stretch to see that a z06 will pull away up top. A 40-120 roll isn't where a c6z will rampage a gt350. A dig to 130, or a 60-160 will be the z's race all day by many car lengths. This is why the ~40-130 race of that video was so good for the gt350. It's gearing and aero aren't hindering it at those speeds too badly
The gt350 has good acceleration from about 40-130. Ironically, those are speeds seen about 99% of the time on a hot lap. Go figure that a track car is setup to do well on a track.
Ok ok... Can we be friends now tt?