Fill the carb fuel bowls too. Not sure what carb you have, if its a Carter, the vents are by the metering rods. Get a tiny funnel and pour just a little gas in both vents-left and right.
Holleys are better, take the sight plugs off and pour gas in each vent tube until gas runs out of each plug hole.
Then on both carbs, pour some gas right down in to the motor.
It has to fire right up for a second or two, might stall if theres not enough gas in the fuel bowls.
If nothing happens , theres no spark or its at the wrong time.