Hi Bob, With 3.73 gears it pretty much will mandate you using 5th gear on most of Elkhart Lake's straights. With 3.55s it's "users choice" if your engine's up to the 6000 rpm task.
The stock cam in the 5.0 breaths okay to about 5K but then seems to become labored. I'm running the E cam which extends the useful power band a bit.
You'll probably still use 5th from #3 to #5 and from the Kink to Canada Corner (#12). Not sure about from #14 to #1.
Brakes are used with gusto at this track. Heavy into #5, #8 and Canada Corner. Reasonable cooling spells in between except 5 to 8.
Best regards, Tom
Port Washington, WI 53074