No start up

Hey guys!

So I have a 75 Duster and it all of a sudden stopped wanting to start up. I could turn it on (started poorly) through putting a screwdriver to the starter so I thought it was just worn out so I replaced the starter today. Nope, still not working. I turn the key and just nothing. The ignition cylinder is also (9 months) newer. Does any one have any ideas what it could be?