Pertronix has officially recalled their epoxy filled coils that were made in China. For the MGs, that would be part #40611. The coil in question can be identified by a full metal can that extends down and covers the bottom of the coil, just like a traditional Lucas coil. Their older design had exposed black epoxy at the bottom of the coil and those are NOT being recalled. Only the new #40611 made in China.
If you have questions regarding this recall, you can reach Pertronix at 1-800-827-3758.