I would assume you have new points and condensor.

I remember having a few bad condensors that were brand new.

Turn the ignition on and with an insulated screwdriver, move the points open and closed. Obviousely it should spark with the ignition switch in the run position. If you look at the spark at the points when you open them, is it a brilliant flashy blue? If so, you might want to try a new condensor.