NO spark question

I went recently went through this with my 69 Charger. I changed the ballast resistor (typical mopar problem) still no spark. I assumed the old coil might have been shot so replaced that...still no spark. Well only thing left was the ignition box, boom fired right off even on 7 cylinders (had one plug out looking for spark). Now I wish I could have checked the voltages but I had a new box in stock, coil I knew I could take back to autozone it it wasn't the problem, and everyone should have a ballast resistor in the glove box.