Dual point Mallory distributor

This kind of thing is why parts stores "are such a crime" nowadays. In my day, be it Delco, Standard Blue Streak, P&D Bendix, or a few other brands, and whether Holley, Mallory, Autolite or what, whether a welder, tractor or hot rod, you reached under the counter which held TONS of catalogs and references, and grabbed the interchange/ numerical listing.........AND SIMPLY LOOKED IT UP

99% of the kids in "parts stores" -------and this includes our local NAPA, have no idea what to do, outside of looking up year/ make / model