The foot box room shouldn't be any smaller than any other build with the available sheet metal options. The new FFR DS foot box metal for the modular engines, which includes the Coyote, has almost the same room on the right side as the foot box for the 302s. They have a left side panel that gives even more room around the clutch pedal. If you check out my build thread you can see a design that gets all the room back on the right side and quite a few builders have used it. As far as the 13s in the foot box, you will have to let the big feet drivers comment on that. I'm a size 9.