So i started rebuilding a 1980 g20 i mixed up the spark plugs and acidently put them in the wronge 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 thig the popping noise was. It started before i messed up spark plugs

 

You must have the timing wrong