The 500 in my 76 chevy pickup quit running the other day. It started running really rough and bogging down and then it died. It is not getting any spark at all. I checked the coil and it is still getting power to the positve terminal and the terminal going to the points still has power. I checked it with the starter cranking too. I replaced the coil, points, and condenser but it is still not getting any spark at all. The distributor is still turning and the points are opening and closing. I also replaced the wire from the coil to the points in case that was bad. Its not the wire coming off the distributor. The coil does not put out any spark at all. Anybody have any idea what could be the problem?