I'd try to borrow some tubbies if possible, if just for the pressure. Assuming equal-or-better aero wheels.

And if it's only 1/2 hour, I'd recommend he spend time in advance watching YouTube videos of elite pursuiters on 250 tracks, particularly Carson, and how they enter turns. QKRTNU is right that if you hug the black line like you can on a 333, the forces you experience in the turn can get more fatiguing than if you just smooth it out slightly. It's possible to hug the black, but if you're going really fast you have to physically brace your body for the forces, and it just wears on you. And definitely do a few hot laps in the aero position in that 1/2 hour.

Edit: And I don't want to be pedantic, but if using road or concrete-velo tires, be sure to wipe then down well before taking the track at Carson. Normal dust can make them slick, and lateral grip is very important, particularly out of the electronic gate. Ask me how I know.