1986 ford 351M turnsover but wont fire up and it

Three things are neede to make a motor run, air, fuel and spark. If your air cleaner is clean and you have fuel in the cylinders then you need to check for spark. take a spark plug out of the head and keep it connected to the wire. Ground the bottom of the plug on the engine (do not hang on to the plug) and turn the motor over. This will let you know if you have spark if you see or hear the charge. Check the firing order as well.