1972 Dart Swinger won't start

I have a 72 Dart with a 318. When I got it it would not fire. I have changed the carb, voltage regulator, ballast resistor, coil, plug wires, plugs, checked the fuseable link, new points, haven't replaced the distributor as it seems to work fine. It turns over fine but just won't hit. Scratching my head . Any ideas?