6tfo, When you install the point dist., don't hook it up through the MSD, Just run it by itself, hook the large brown factory wire from the fire wall to the + on the coil, then the black wire from the dist. hook to the - side of the coil, Now on this dist. definitly hook up the vacuum advance, timed port should be fine, direct port it'll bring the timing up a good 10-12 deg*, If your able to time it propperly, then its either in the MSD box or the polarity's off.