If you just talking about the magnetic point replacement unit that installs in the existing distributor, I just installed one last weekend. I haven't really put it to the test, but it seems to work fine. The installation is pretty simple, but you will need to remove the distributor to make the change. If you buy one, just be sure that you follow instructions and mark the distributor and rotor cap orientations before you remove it. I forgot to do it and it cost me about an hour to get the timing straight.
69 SS Silver Bullet
I just put one in last weekend also. So far I like it a lot. Like Randy said, you will have to pull your distributer to run the wiring, but it's worthwhile. Also don't make the mistake I did. I wired the hot lead to a switched 12 volt source, but one that was turned off when the ignition switch was turned to "start".
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