6-71 small block build.

Ok so I have a stupid question but I am curious and have no knowledge in supercharging. The "base" of the supercharger (dont know the right word) but that acts as the intake manifold correct? Do you have to find a small block mopar "base" for the 6-71 charger or is it a part you can buy or do you have to fab one?

Used to be you had to make one from a standard four barrel intake. But in the recent years, there are a couple of companies that make them. They're proud of um though.