I'm toying with the same issue as well. Have you considered using the 4" ovalized adapters that transition from 4" round to whatever-size oval adapters to attach them to the cowl? The ones with a built in flange that allows you to secure the feeds to a flat sheetmetal surface with screws.
I bought a cast aluminum air cleaner hat to put on my 408" stroker, but I'm wondering if a single 4" inlet is enough.
I don't have a lot of hood clearance, and have to keep the height below 3 1/2 something inches. I would prefer to use a twin 4" inlet filter, but one with a drop base and a 14" by at least 3 inch filter.
I was using this conglomeration of the stock stuff with a K&N, but I was told it only flows about 600 cfm.
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