I hate it when I do things like that! having to start all over again, and then some epic mishap happens! Sounds like you were very lucky though, with fireworks but no damage.
After all this brain storming and lining up small parts for the 412 headers, The seller backed out! He had been nagging me over and over, and when I accepted, he raised the price! Then I accepted again, and then he declined again and listing them on Ebay! Still cheap , but I don't have the heart to deal on that type of basis.
Now I 'm thinking back to plan 1. Take the headers off, weld the flanges correctly, repaint the headers, and stick them back on.... :roll: