Could my 340 block be filled?

I try to go at a no spark with a simple routine, power, ground and the proper pulse to drive the ignition coil. As i prove out working components i move on to the next one down the line. My career is made up of troubleshooting fuel injection and electrical diagnosis, i dont get many oppurtunities to work on the early stuff any more,yet i find it about as difficult as changing a light bulb. No msd stuff on my customer's classic cars but the theory is the same.