Ancient evidence from a slightly different event, the 1,000 yard run. Two races in winter '77.
Race one: 58 quarter mile, 2:00 half mile, 2:17.6 1,000 yards
Race two: 58 quarter mile, 1:58.5 half mile, 2:17.5 1,000 yards
Suggestion: Run the first 600m about even, then start a long push. Don't go too fast too soon.