1970 Chevelle 396 HEI Ignition No Spark

All I can tell you is, you MUST have the ground blade in that center slot on the cap. If it's not there, no run. There were two different styles. One used the separate grand strap with the hook that installed under the coil. The other had a made on blade that was soldered to the ground wire on the coil. The ground wire attached to the coil and the ground blade was soldered to the same wire. If that center blade is not present, or if it is not attached to the ground wire, it ain't gonna run. Period.