It is true that most of FUMA's best runners in the past were of East African descent, but Coach Brown does not use a cookie-cutter approach to his training. He tends to tailor training to the individual - if a runner can't handle big miles, he doesn't do them. If another runner needs mileage to progress, he puts in the miles. If a combination is required, that is done. My guess is that the original poster would be able to work with Coach Brown and they would develop a program that would work for him.
Last year, a young man named Andrew Rademaker left FUMA with a PR of 9:25 in the 3200. He started high school not being able to break 20 minutes on the notoriously fast Burke Lake course (2.98 miles). Certainly, four years of maturing and naturally growing stronger were important in his improvement, but it was his dedication and Coach Brown's skills that got him that 9:25.
The latest horse in Brown's stable is Axel Mostrag (Eastern European in this case). He showed up at FUMA with some obvious talent and a great set of wheels, but with little experience running XC or even the 3200. Coach Brown has put some base behind the speed and I think the surface was barely scratched with his recent 4:13 (DMR leg)/1:53 800 at the Nike meet in Maryland. 4:10/1:50 are absolutely doable this spring.
FUMA isn't for everyone, but at least from the running aspect it can hold a lot of promise. It is a military school and doesn't coddle anyone. As a graduate of a New England prep school and now the father of a runner at FUMA, and given the choice, I would attend FUMA.