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I used to run .060-.065 with my MSD box, wires, coil, etc. Now that I went to FI from carb and don't have the MSD I run .02-.03 over what stock specs is for the TPI.
I got the AC Delco rappid fire ones and it said NOT to gap them. They were off from what the blazer normally uses but I didnt gap them and they work great. If you have platinum plugs dont gap them because it can mess them up.