That’s a Street/ Strip model ignition and probably the same as all the others in that class. 135 mj .7 A per 1k rpm. MSD does not disclose this information in the specs and perhaps it’s because it could be lower than this. The old 6al is only 105 mj and many are still using this.

 

Thanks

 

They don't list a rating because this is not a CDI box. CDI boxes are rated by the energy stored in their capacitor. Here, the energy will depend on the specs of the coils being used and how long they are dwelled. The box is strictly a timing / dwell controller with all the high powered devices are inside the coils, so it's not possible to assign these boxes a spark energy rating on their own.