motor wont turn over?

did you have the dist out ay one time? maybe there is no roter under the cap.Was it runing befor you took the heads off.realy it should star right up or even spit and sputter or back fire or bad gas.Pull #1 plug finger in the hole find top dead center pop the dist cap rotor should point at #1 plug.Recheck everything.Do us a favour let us know what it was.Good luck.