Share 'Dieting/training..at the same time?'

Hey everyone. I am in need of some help. I am coming up on my first cyclocross season, just picked up a used Redline and need some fitness help. I am weighing in at 260 and need to drop some serious weight. I'm concerned about limiting calories due to bonking during my training sessions/races this fall. Has anyone had any experience with this? Any nutritionists in the house? I understand the calo…