Go ahead and apply. The worst they can say (and probably what they *will* say) is "need more info."
My ds was tested at 5y5m and was just short on his WPPSI (148 FS) but had qualifying WIAT reading and math. They asked for more info. I sent in a pretty strong portfolio a few months later, and he was accepted with that.
I included a few work samples (not crazy advanced); a few pictures he'd drawn with odd things in them (a landing spot labeled "surface," a hurricane with the eye and eye-wall labeled, a few photos, and two videos: one of him talking about tornados, his erst-while obsession, and one of him talking through a math worksheet. The math one wasn't crazy advanced, but his fluent reading of the word problems and his enthusiasm both showed. Send me a PM if you want to see what I did.
Good luck! No harm in applying.
