1973 Dodge Dart Sport won’t run right or stay running

You replaced everything that was good. Problems like this you have to eliminate step by step. Check spark when it dies. Check to see if there is gas in the carburetor. Could be a clogged fuel filter or a weak fuel pump. Have you had car long or just got it? Do you have a clear fuel filter? If not put one on to eliminate fuel problems which is what it sounds like. Filter should be at least half full and you can tell if there is S---t in the tank and clogging things up. Good luck and let us know what the demon was your problem.