I raced at IMMoo last year. What can I say? Pace yourself...I came through mile 80 at 3:50 and EXPLODED for a 5:42 bike split (don't even ask about the run).
As for equipment...I made the mistake of selling my Zipp 404s last spring. I used Ksyrium SSC SLs at IMMoo. They are adequate, but I think 404s are the best possible set-up.
Here's why:
Mile 1-16 fairly flat with a prevailing tailwind (aerodynamics are important)
2 Middle Loops have many corners and short/steeper hills...I think a wheel that you can easily accelerate is critical here.
Mile 94-112--Return on flat into stronger prevailing headwinds...Aerodynamics returns as a key feature.
I have 909s this year, but I'm not sure that even a very light disc like a Zipp will be optimal for all but the strongest riders. Here would be my thoughts...If you are strong enough to go sub-5:20 on most courses, pull out the 909s. If not, use 404s.
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