You can turn it with a breaker bar but you probably won't get too far with spark plugs in.
You also need to completely empty the fuel system, ensure the pump works, and that the rails and lines aren't clogged with old fuel that has turned to varnish.
There is a pretty good chance that you will set yourself back many weeks if you try running that engine on 8 year old gas.
I would recommend disconnecting the fuel lines at the rail and pumping anything that is in the tank, into a gas can by bypassing fuel pump relay with a jumper. Disconnect the fuel rails from the injectors and blow a mixture of air and brake cleaner through the rails.
Look over the injectors good while they are out. Check the o-rings and pintle caps for damage. Replace the rings and caps that look damaged or old. Put the whole thing back together with a super thin coating of dielectric grease.
If I missed anything, I'm sure that the others will chime in.