Mike,
Here is the link:
Le Mans in GT40, LM Classic 2008 - YouTube
Notice the rpm of his shift points and then listen on the straights. He revs higher down the straights and sounds like he lifts to avoid over reving. If that is a 220 mph speedo, then he is doing 200 on the straight. Therefore, he runs out of gears before he runs out of power. That is an original GT40 with a 289. Fantastic sounds. I think that is what I will enjoy about my GT40 as much as anything.
On the nostrils, I did the same thing.
http://www.gt40s.com/forum/gt40-build-logs/42186-tornado-gt40-texas-9.html?highlight=tornado+gt40+in+texas #163.
After I did that, I found out that evidently the CAV comes with the deep double nostrils. I think it is a mandatory modification.
The attached photo shows my finished nostrils.
-Bob Woods