Describe the process you are using to start the car.
Like...
Pump gas 2 times, turn key to start, engine cranks over but doesn't start.
2 more pumps and turn key to crank etc.
You need to do some more sleuthing
Get a helper
With key off measure voltage at the ignition side of the ballast and the dust side of the ballast. You should have 0 volts.
With the key in the run position measure the same points. You should have 12v (battery voltage) to the ignition side of the ballast and 7 to 11 volts on the coil side of the ballast
Remove the yellow wire from the starter relay.
With the key in the start position measure the same points. You should have 12v (battery voltage) to the ignition side of the ballast and 12v (battery voltage) on the coil side of the ballast.
And report back your findings.
This problem is a process. You shotgunned all the parts but still have the problem.
So now let's go through the systems one at a time verifying their function.