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If you are getting a better spark by jumping the points with a screw driver check to make sure that the points are actually closing all the way.

To check spark pull the coil wire out of the top of the distributor and put that end of the coil wire a short distance away from a head nut. Make sure the rub block on the moveable point arm is on the lowest point on the distributor cam. You should be able to repeatedly open the points with a finger nail to see what kind of spark you have. Or while standing on the drivers side of the engine hold the coil wire with your left hand and use your right hand to push down on the starter rod just above the starter to turn the engine over.

Check the carbon contact on the underside of the distributor cap to see if it has worn flat and not contacting the spring wire on the rotor.