You may want to check your timing. I had this exact same problem after installing a crane igniton with a mallory distributor. The two didn't work very well together (lots of advance at idle). It's a long shot but you might want to check it.
Dave
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85 GT 10 pt cage 11.68 to 1 408 windsor ported dart sr's super victor 9 inch w/4.11's bigshot plate turbo 350 trans etc etc
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