HELP PLEASE! Engine Trouble

[quentin hill]

I have a 72 C-10 350/330hp Holley 600cfm, HEI Dist, It fires but will not start!

I have checked the fuel pressure, Good!
I have checked for spark on the distributer, Good!
I had the carb rebuilt, Good!
I tried to replace the ignition module, still does the same thing
I checked the distributer cap for cracks or damage, all looks good
I checked the turn signals with the key in run position, Good!
I tried dumping some gas in the carb just to check, still does the same thing
I pulled the plugs out and cleaned them they were black as a struck match

The manifold has gas in it so its getting fuel, so I am assuming it's something to do with spark but when I checked it with a screw driver it had spark.

I don't know what to do, what am I missing? any help would be much appreciated!