[Schroedum]

The gears on the dizzy are cut in a sort of spiral. For that reason you should try dropping it in a tooth or two back from where you want it to be. So try dropping it in pointing at the number 5 to start and it should be lined up at the number 1 when it falls in. Then when it's in as far as you can get it have a buddy bump the starter, or turn the engine by hand, while you push the distributor down to let it drop onto the oil pump assuming it didn't already. Just go slow and don't hit it with a hammer.