My old 93 was able to pass emission's with a Powerdyne supercharger, SVO injectors, Borla y-pipe, Random high flow cat, Flowmaster cat-back, Jacobs ignition, 160 t-stat and SLP off the shelf chip(not programmed for the supercharger). So you must still have something pretty wrong to be running rich and not pass. Put a scanner on it to look at the sensor's to see if you can find something that indicates why it's running rich.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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