engine won't fire up?

[37fordtruckguy]

ok I have a question that might baffle a few of you. The other day I decided i would try and get some tuning done on the motor. When I went to turn it over i have nothing. I have checked everything i can think of, cleaned the points, gapped the spark plugs, checked the condenser and made sure the carburetors where working, and everything checks just fine. I even have spark, yet it still wont fire up.