HEI module going spastic?

I just installed a new HEI module under the distributor on my 340 with the commerical heatsink. Now the engine runs rough at all speeds due to what feels like a misfire. I put a timing light to each spark plug wire and noticed something strange. On seven cylinders, I get what appears to be a normal fire rate. However, on Number 3, the flash rate is much, much faster and appears to skip a beat every now and then. Anyone every experience something like this? Engine is idling at 1000 RPM. I disconnected the tachometer and the rev limiter is not hooked up at all. Plugs are gapped at .042.

Bad module?

[ame="http://m.youtube.com/watch?v=VDS9JVeXlLU"]HEI firing anomaly - YouTube[/ame]