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As close as possible to the centre of mass of the frame, so that it doesn't make the bike respond in any unexpected or unusual way when peeling off the front of the paceline.
Assumption: pursuit = team pursuit; maximize benefit = minimize adverse effects
Cupcakes-
As close as possible to the centre of mass of the frame, so that it doesn't make the bike respond in any unexpected or unusual way
It's <1% change in bicycle mass, and we can assume that the rider and/or team will train thoroughly with the ballasted bike before riding the record attempt/championship race.
gbj_tester
There's an interesting thing here for more advanced maths illustration. Leaving the inner tubes aside, because they are nothing like a simple change of mass, let's say the initial sample bike comes in at 6.75kg. To pass scrutineering, you buy a 50g slug of Tungsten and glue it inside one of the frame tubes. On a pursuit bike, where do you glue it to maximise the benefit?