Hmm may need to build a full short transmission.
Let me poke around my 2cv and see what I can do with it. The power band is semi large so it's just a matter of getting the gears set up to stay in the power band and still reach top speed.
Edit;
Yeah it's got so little power bog is sadly going to happen if you need to reach 160+ km/h in 4th and 5th gears. I tried but I couldn't make it short enough in 1-3 to stay in power and still be in power 4-5 for 165 km/h top speed.
Anyways.
Set final gear to 3.525
Set top speed to 150 km/h
Set all gears full right.
Set final to track.
Full left final will give top speed of 165+ km/h *I couldn't catch a long enough draft to find out rev limited top speed*
Note reduce Inital final to 3.485 to stay in power all gears but you sacrifice about 20 km/h off your top end.