No electrical at all

Actually the sparks may not have been a short at all but just the opposite. A loose connection. Sparks can occur when electricity tries to flow but the connection is bad. This would explain why you don't have power now. The bulkhead connector has been a problem point on old Mopars for a long time now. Even though you said you wiggled it around and saw no problem that isn't good enough. You need to disassemble it to inspect the condition of the connectors. You might find 1 or more corroded or burned up. Especially that blue wire you mentioned. If it's melted it probably isn't making contact. Also check your fuse box real good. Mine in my 68 Cuda was rusted where the fuses make contact to the point that it needed replacing.