dwajeep

What is the silver box on the front of this coil that came off off my '79 CJ7? I pulled this coil off, and have added the TFI coil & distributor cap/body/wires conversion. But the new coil gets very hot and smokes when ignition is on. Should I have included the silver box on my new TFI coil install? No ne can tell me what this is so far. Thanks!