Ride a disc or not? with Hed3 front?
Weeman
Flat, fast course. Ride whatever your fastest wheelset is… unless you’re in the 35-39 AG. Then you should ride your slowest wheelset. 
Like Steve said. There is not much elevation delta, and it is generally gradual. A few rollers - bring your ‘A’ rig.
DB
For all of you other fellow 35-39 ers, I just want to remind you that it’s a 3 loop bike course 
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You got nothing to worry about. If I happen to come in before you on the bike, I’ll sadly watch as you (and everyone else) pass me on the run.