There should be no gaps along the sides. The tricky part is at the rear - where it goes over the peak of the hood. My original KB scoop fits that peak very well with just a very small gap. My scoop has 8 holes for bolts, 4 on each side. I mount mine with 10-32 stainless bolts.
The two bolts in the back on eather side of the peak are a pain, as there is not much room between the top of the scoop and the bolt holes. You have to get the perfect size bolt to fit in there.