Less than 8 weeks to Race Day

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I am running my 4th marathon the 1st weekend in April. Hoping to drop 5-10 lbs by then by watching my in take a little bit closer. Currently, I'm limiting to 2000 calories a day and not adding back for my exercise. I run 5 days a week- 40ish miles a week, strength training 2 days a week.

My question is, on my long runs over the weekend, I will burn over 2000 calories and I will be hungrier. Wondering what kind of target I should have for those? Any suggestions?