The dry sump is for road racing purposes. The chassis that Mat is messing with has the ability to pull some pretty substantial G's if Mat doesn't fill his shorts first. Keeping the bearings lubed is paramount in situations like that and a dry sump will scavenge from various parts of the
oil pan....which ever part has
oil in it, that's where it will get it.
I use Comp rockers on a lot of high horsepower stuff. These are stud mount. If this was a 7000 rpm engine, I would think about shaft rockers or at least a stud girdle. However, it should peak way shy of that.