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Another thing just occured to me. You have a 71. If you have HEI then it has been changed from points to HEI. 71's came with points. A common problem/mistake with this change is that the HEI takes a full 12 volts. If you are still running the original "hot" wire(the wire on the negative side of the coil) from the points-type ignition, then you are not getting 12 volts to the disty. That wire has built-in resistance which was required for points type ignition. Hope this helps. -Mark