If it got that hot you probably ruined the temperature sensor for the ECM. This could cause it to think it was cold and dump more fuel. As far as blowing out oil and valve cover gaskets, depending on how hot it got you may have broken a ring or cracked a piston and now you have massive blow by.
Those grounds are important and need to be connected. This could cause the temp sensor not to work
Artificial Intelligence is no match for Natural Stupidity