Hm, I suppose I should do the decent thing and admit that I have copies of both Masks and Mountains. Though I haven't read more than like, 5 pages of Mountains, which is why I was hoping to play though it first. It's rare for me to find CoC materials I haven't played through.
I have run Masks before, but it looks like everything is taken care of for that.
Now, for the tricky bits:
1. I'd have to read Mountains, and that ain't no small thing. The book is roughly the size of my local yellow pages- it's easily the largest RPG book I own, or have even seen for that matter.
2. I've just started up my arcanis game, and the past few days have shown that I barely have time to keep up with that. And I'd say that is definately a prior commitment, at least from a GMing perspective.
3. My last CoC game crashed like Amelia Earhart's Cessna. Maybe it was the pacing, or the way I was trying to organize things, I don't know. It was my first time running a pbp.
So, I guess the long and the short of it is that I may be able to run if I had to. But there's no guarentees. So we should definately try to find someone first.