HEI conversion help

It's supposed to also maintain multiple spark throughout the RPM range so I wanted to hide it in an old Mopar box and make everything look stock , it's insane the things they require us to maintain in order to keep our Collector Plate status here .I can lowjack the car but I can't put any sort of aftermarket radio that doesn't fit into the factory location and appear to be original , a trunk or glove box mounted stereo voids my insurance .