You say no spark with the clip on tester, try an actual spark plug, laying on something it can ground on. NOT near the carb please. Spin the motor, look for spark. If no spark, confirm 12V to dizzy. If 12V is good and no spark, you have an issue under the cap. Did you install the rotor? Rotor button? Try swapping in a new spark module. I had a dodge that would randomly blow out the module for no apparent reason. (Used the same module as Chevy HEI)