Replacing my points distributor

I am guessing the Mallory box was a "points-triggered" type, like the Delta CD box on my 1965 Newport when I bought it (long gone). Unless you really want to stay Mopar, an HEI ignition is cheaper, simpler to wire and a better spark, plus parts are easy. Simplest is the new "ready-to-run distributor" ($45 ebay). Another is a Mopar e-distributor an external HEI module (many posts here). The new Pertronix Ignitor III is good, but sounds like your points distributor can't be leveraged for that.