the easiest way to get the bolt loose is with and impact wrench if you have one. or you can use vicegrips like mentioned above. what i did was have a friend hold a screwdriver between flywheel and starter.
you will need to pull crank pulley off. autozone prolly wont have one for this engine but i found a youtube video a couple months back that shows how to use a standard puller with 1/4" bolts. If you cant find the info let me know and ill send you a link.