Lets go back to what R Pope said. He ask if the fuel pump push rod was out. You said you removed the fuel pump. How about the push rod??? You could have removed the fuel pump and the push rod could still be there blocking the cam. If you had 5 mechanics trying to get the cam our surely someone has looked for the fuel pump push rod.I would guess by now that enough damage has been done to the cam bearings that you need to take a very close look. Good Luck!