74 Duster (318) ignition not working, not getting spark

The "Balllast resistor" Halifaxhops is referring to looks like this, and would be mounted on the firewall:
Screenshot_20210221-061705_Chrome.jpg
Older cars in many ways are simpler to figure out, it can get tricky if things were changed or modified. There's very knowledgeable members here that can walk you through the diagnosing.
To avoid confusion, use the term, "cranks" but "No start".
("Turn over" usually means that the engine cranks and runs like normal).
FSM = Factory Service Manual, can download it from "MyMopar".