Please help to select the right stuff, Distributor, wires...

1973 DODGE DART Summit Racing® Electronic Mopar Distributors SUM-851003

Here's a Mopar original style kit that will work just fine, and even comes with the wiring harness for it.
That distributor will run just about any other ignition system out there as well if an upgrade comes later.

The above distributor is a direct fit in the magnum motor.