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Perry,
You need to limit the amount of mechanical advance in the distributor. Different manufacturers use diferent methods accomplish this: bushings, adjustable stops, or electronically. The springs change how fast the timing is advanced.
If your initial timing, at idle, is set at say 8 degrees to get that 34 degree total and you recurve the distributor so your initial timing is now 18 degrees, and the same 34 degrees total, the idle speed will now be higher with the extra advance. Now you can close the throttle plates by backing out the idle speed screw and that should take care of the "run on" problem. If you retard the timing, you will have to open the throttle plates more to get the motor to idle and that will make the "run on" problem worse. After you get the timing sorted out, you can readjust the idle mixture. Do all the mechanical timing checks with the vacuum advance disconnected.
Depending on which distributor you have, getting the curve you want can be fairly easy, or a pain in the a$$. What distributor do you have and do you have the instructions that came with it? You can probably do the distributor mods yourself and not have to send it out.
Let me know what distributor you have, what your timing is at idle and at what rpm your advance is all in.
Dana
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