For the high price Edelbrock should provide the mounting hardware since the OE bolts will not work. They do not even recommend the bolt length that works so you have to measure accurate. The optimum length is in between any standard metric size so getting the right length can be tricky.
They do provide two studs that are unique to this manifold but at a minimal cost could have provided a complete bolt kit just as they do with the similar application and less cost Victor Jr.