Don't guess learn how to troubleshoot. You can download a 73 shop manual for free from MyMopar. That manual and several others over there came from the efforts of guys right here
Also "somewhere" is a poor quality wiring section for 74.
Free service manuals
You need "at the least" a multimeter which you can buy at any auto parts store, hardware store, Lowe's or HD or even Horrid Freight
Start by examining the condition of the ignition system. Pull the cap and rotor and examine for dirt, moisture, foreign materials, "tracking" around the inside of the contacts, and damage and "punch through" of the rotor. Examing the reluctor and pickup for damage, heavy rust and debri
Next get/ rig yourself a spark tester. I use a Lisle as it is adustable, less than 10 bucks
