Air cleaner not centered for scoop

Is there a base plate that centers a 14" air cleaner, or any size filter, to go under my Hemi scoop? I tried doing a search but haven't found any useful info on this. I have a 318 and have it all marked out and its about 3" to the passenger side. Just curious if this is the norm for mounting a through the hood intake. I ask because it looks as though there is a kind of a centered stamped ring for an offset base on the underside of the hood. I have an air gap high rise manifold, with a hemi scoop ready to be mounted, just looking for some insight on different ways, and maybe a right way to do this. Any help out there?