First you're going to have to see if it's getting spark to the plugs. If not, work your way back to the points/condenser/dizzy, etc
Then see if the carb is getting fuel. If it is, look down inside the carb with thje throttle open and see if gas is pooling on the intake runner. If it is, your carb/accelerator pump is leaking causing a flooding situation.
Test the acc pump by looking down the throat while goosing the throttle and see if it's working. You should see a nice squirt of fuel.
Maybe your starter isn't dead. Jump the starter directly from the battery and see if it works. If it does, your ignition switch/wiring is probably the problem
