70 Duster no start-turn over troubleshooting

I have a 70 Duster /6 . 3 Speed on floor that will not turn over. I am trying to get it running so I can pull it out of the garage to take some pictures and sell it. I bought it 5 yrs ago with hopes of learning how to restore it into a 340 clone but I realize it will never get done and the wife is tired of it taking up space in the garage. I have a 72 dart 340 clone that is partially restored and will keep it to enjoy.I appreciate any advice on where to start on troubleshooting this problem. Thanks.