The FPR just needs unregulated vacuum which it sounds like you gave it.
Maybe you should go to a dyno with a wide band O2 sensor and see what your air/fuel ratio is running at. You may also want to hook up a fuel pressure gauge to watch what it does when you're driving.
You should probably have your gap at about .060 or thereabouts, especially with a high output ignition. If you're running platinums, it should be even more.
What heads are you running and what do you plan to get?
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