No spark but 1 spark on "shutdown"

Giving myself daily headaches trying to figure this out,,, I had a running driving car but motor was messed up so I pulled the motor out of a 73 parts car. Installed new cam and lifters and cleaned it all up,, installed the motor and trans. Hooked up wires just like they were before motor swap. Now no spark,, its set on TDC,, everything is the same. I had no spark so had coil tested,, turned out it went bad so installed an Accell comp coil,, I have a procomp HEI dizzy.. Still nothing but I pulled the coil wire off the dizzy and tried it only to get the 1 spark when I turned the key off.. Where do I look now guys?