Misfiring

This car has been sitting for three years, it was a friend of the family's so I know it was Sitting for years. They could not tell what was wrong with it and I got it for almost nothing.
2002 Oldsmobile Aurora 3.5l misfiring and running rough. Now only misfiring and will not crank. I replaced the fuel pump, and fuel filter, both coils, new plugs, drained fuel tank cleaned it out blow out fuel lines replaced all six injectors, It tries to fire but does not start. Now there is the crank and cam sensors and the possibility of timing chain jumping. Does this car have a timing mark on the harmonic balance pulley? I would to try and see if it did jump timing.