having starting and electrical power problems

So i started rebuilding a 1980 g20 i mixed up the spark plugs and accidentally put them in the wrong order when i did that i tried to start it. When i did this a loud popping noise accured n now i cant start it their seems to be no power to distributor or starter but head ,lights work what do you guys think the popping noise was. It started before i messed up spark plugs

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