Slant 6 HEI problems

If you have a spare cap, drill a hole in it and shine a timing light to see where the rotor tip is relative to the #1 tower when it sparks. This checks "rotor phasing". Search for the Crane XR700 manual for a description, or youtube videos. Some Mopar reluctor wheels have phasing issues. Forgot the details, but Rick Ehrenberg sells a custom reluctor on ebay to fix that. If you have the pickup leads reversed, it will spark when the rotor is between 2 towers, which will definitely make it run funny. HEI works best with an e-core coil, which you can buy cheap on ebay or get a junkyard one for a Magnum 5.2 or 5.9L engine to stay Mopar.