Even with a Thomson 410mm seatpost you are probably really gonna be pushing the limits. I am "only" 6'4", riding an '06 Stmpjumper FSR, and I put a 410mm Thomson on mine almost immediately. I am not too far from the minimum insertion marks. Additionally the handlebar is going to end up WAAAAYYY below your saddle. I have already replaced my stem and have ordered a new 1.5" rise bar to even things up a tad.
FWIW, I rode an XL Enduro and it felt very similar to what I have now.
Like what has been suggested, find a shop with an XL and take a spin. Watch your leg extension.