For want of something better to do was just looking at Dodge Monaco engine bays and the original air filter box on those looks more subdued/period than your current hi-flow arrangement and would certainly be quiet. I suspect it might need some modification to fit but I'd probably start from there if it was me.
Impressed with neatness and cleanliness of engine bay! I also have one of those bling alternators - also inherited!
If you're already way ahead of me on the air filter box, apologies.
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