Tim, with your engine, I don't see any advantage to dual points. They are nice to tinker with, but your engine won't go fast enough in stock form to gain any advantage in performance. Also, the original Delco ignition coil (or a proper OEM replacment) has a low enough primary inductance to keep spark plugs firing beyond about 5500 RPM with 6-cylinder dwell. Around that RPM, you will probably start getting misfires mostly because of point bounce, and maybe valve float. Also, I think the carburetor may limit the engine speed to something around 5000 RPM under load, but I'm guessing at that number.
Its a little off the subject of Stovebolt engines, but the MoPar/Chrysler 8-cylinder, dual-point distributor/ignition system was one of the best OEM systems around before before the Delco magnetic pulse electronic system that evolved into the present HEI system. But the Delco OEM dual-point system was no slouch, and would keep up with any of the after-market units, except maybe the Mallory system. And it was/is considerably better than a good many of them, and at a far lower cost.
Hope this helps.
Harvester
