Hei Coil burnt x 2

[neto]

Would a lack of grounds burn a coil? It rained today and was wondering if I lost ground somewhere? Does any one know where to ground and what to ground besides everything? 73 truck, converted to hei, was running fine till this morning when it wouldn't start. I check all connections and turned out to be the coil. I replaced the coil and it started right up. Moved it a bit then started it once more and that's all she wrote. I have another coil but don't want to put it in yet until I figure what happened.
Thanks.