Only issue you might have is the locknut width on the xtr hub and the rear stay width on your masi. The hub is 135mm and the frame is 126mm if that's a 7speed tricolor downtube shifter, and 130mm if its an 8 speed tricolor downtube shifter.

(If it IS an 8 speed, and you're willing to sell it, please PM me, I've been looking for one of these for a long time, as well as tricolor brake levers- looking to downgrade a bike of mine.)